Thomas Alva Edison Essay In Sinhala

Thomas Alva Edison (February 11, 1847 – October 18, 1931) was an American inventor and businessman, who has been described as America's greatest inventor.[1] He developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and the long-lasting, practical electric light bulb. Dubbed "The Wizard of Menlo Park",[2] he was one of the first inventors to apply the principles of mass production and large-scale teamwork to the process of invention, and because of that, he is often credited with the creation of the first industrial research laboratory.[3]

Edison was a prolific inventor, holding 1,093 US patents in his name, as well as many patents in the United Kingdom, France, and Germany. More significant than the number of Edison's patents was the widespread impact of his inventions: electric light and power utilities, sound recording, and motion pictures all established major new industries worldwide. Edison's inventions contributed to mass communication and, in particular, telecommunications. These included a stock ticker, a mechanical vote recorder, a battery for an electric car, electrical power, recorded music and motion pictures. His advanced work in these fields was an outgrowth of his early career as a telegraph operator. Edison developed a system of electric-power generation and distribution[4] to homes, businesses, and factories – a crucial development in the modern industrialized world. His first power station was on Pearl Street in Manhattan, New York.[4]

Early life

Thomas Edison was born in Milan, Ohio, and grew up in Port Huron, Michigan. He was the seventh and last child of Samuel Ogden Edison Jr. (1804–1896, born in Marshalltown, Nova Scotia) and Nancy Matthews Elliott (1810–1871, born in Chenango County, New York).[5] His father, the son of a Loyalist refugee, had moved as a boy with the family from Nova Scotia, settling in southwestern Ontario (then called Upper Canada), in a village known as Shewsbury, later Vienna, by 1811. Samuel Jr. eventually fled Ontario, because he took part in the unsuccessful Mackenzie Rebellion of 1837.[6] His father, Samuel Sr., had earlier fought in the War of 1812 as captain of the First Middlesex Regiment. By contrast, Samuel Jr.'s struggle found him on the losing side, and he crossed into the United States at Sarnia-Port Huron. Once across the border, he found his way to Milan, Ohio. His patrilineal family line was Dutch by way of New Jersey; the surname had originally been "Edeson."[7]

Edison only attended school for a few months and was instead taught by his mother.[8] Much of his education came from reading R.G. Parker's School of Natural Philosophy and The Cooper Union for the Advancement of Science and Art.[9]

Edison developed hearing problems at an early age. The cause of his deafness has been attributed to a bout of scarlet fever during childhood and recurring untreated middle-ear infections. Around the middle of his career, Edison attributed the hearing impairment to being struck on the ears by a train conductor when his chemical laboratory in a boxcar caught fire and he was thrown off the train in Smiths Creek, Michigan, along with his apparatus and chemicals. In his later years, he modified the story to say the injury occurred when the conductor, in helping him onto a moving train, lifted him by the ears.[10][11]

Edison's family moved to Port Huron, Michigan, after the railroad bypassed Milan in 1854 and business declined.[12] Edison sold candy and newspapers on trains running from Port Huron to Detroit, and sold vegetables. He briefly worked as a telegraph operator in 1863 for the Grand Trunk Railway at the railway station in Stratford, Ontario, at age 16. He was held responsible for a near collision. He also studied qualitative analysis and conducted chemical experiments on the train until he left the job.[13][14]

Edison obtained the exclusive right to sell newspapers on the road, and, with the aid of four assistants, he set in type and printed the Grand Trunk Herald, which he sold with his other papers.[14] This began Edison's long streak of entrepreneurial ventures, as he discovered his talents as a businessman. These talents eventually led him to found 14 companies, including General Electric, still one of the largest publicly traded companies in the world.[15][16]


Edison became a telegraph operator after he saved three-year-old Jimmie MacKenzie from being struck by a runaway train. Jimmie's father, station agent J. U. MacKenzie of Mount Clemens, Michigan, was so grateful that he trained Edison as a telegraph operator. Edison's first telegraphy job away from Port Huron was at Stratford Junction, Ontario, on the Grand Trunk Railway.[17]

In 1866, at the age of 19, Edison moved to Louisville, Kentucky, where, as an employee of Western Union, he worked the Associated Press bureau news wire. Edison requested the night shift, which allowed him plenty of time to spend at his two favorite pastimes—reading and experimenting. Eventually, the latter pre-occupation cost him his job. One night in 1867, he was working with a lead–acid battery when he spilled sulfuric acid onto the floor. It ran between the floorboards and onto his boss's desk below. The next morning Edison was fired.[18]

One of his mentors during those early years was a fellow telegrapher and inventor named Franklin Leonard Pope, who allowed the impoverished youth to live and work in the basement of his Elizabeth, New Jersey, home. Some of Edison's earliest inventions were related to telegraphy, including a stock ticker. His first patent was for the electric vote recorder, U.S. Patent 90,646, which was granted on June 1, 1869.[19]

Marriages and children

On December 25, 1871, at the age of twenty-four, Edison married 16-year-old Mary Stilwell (1855–1884), whom he had met two months earlier; she was an employee at one of his shops. They had three children:

  • Marion Estelle Edison (1873–1965), nicknamed "Dot"[20]
  • Thomas Alva Edison Jr. (1876–1935), nicknamed "Dash"[21]
  • William Leslie Edison (1878–1937) Inventor, graduate of the Sheffield Scientific School at Yale, 1900.[22]

Mary Edison died at age 29 on August 9, 1884, of unknown causes: possibly from a brain tumor[23] or a morphine overdose. Doctors frequently prescribed morphine to women in those years to treat a variety of causes, and researchers believe that her symptoms could have been from morphine poisoning.[24]

Edison generally preferred spending time in the laboratory to being with his family.[25]

On February 24, 1886, at the age of thirty-nine, Edison married the 20-year-old Mina Miller (1865–1947) in Akron, Ohio.[26] She was the daughter of the inventor Lewis Miller, co-founder of the Chautauqua Institution, and a benefactor of Methodist charities. They also had three children together:

Mina outlived Thomas Edison, dying on August 24, 1947.[30][31]

Beginning his career

Edison began his career as an inventor in Newark, New Jersey, with the automatic repeater and his other improved telegraphic devices, but the invention that first gained him wider notice was the phonograph in 1877.[32] This accomplishment was so unexpected by the public at large as to appear almost magical. Edison became known as "The Wizard of Menlo Park," New Jersey.[2]

His first phonograph recorded on tinfoil around a grooved cylinder. Despite its limited sound quality and that the recordings could be played only a few times, the phonograph made Edison a celebrity. Joseph Henry, president of the National Academy of Sciences and one of the most renowned electrical scientists in the US, described Edison as "the most ingenious inventor in this country... or in any other".[33] In April 1878, Edison traveled to Washington to demonstrate the phonograph before the National Academy of Sciences, Congressmen, Senators and US President Hayes.[34] The Washington Post described Edison as a "genius" and his presentation as "a scene... that will live in history".[35] Although Edison obtained a patent for the phonograph in 1878,[36] he did little to develop it until Alexander Graham Bell, Chichester Bell, and Charles Tainter produced a phonograph-like device in the 1880s that used wax-coated cardboard cylinders.

Menlo Park

Research and development facility

Edison's major innovation was the establishment of an industrial research lab in 1876. It was built in Menlo Park, a part of Raritan Township, Middlesex County, New Jersey (today named Edison in his honor), with the funds from the sale of Edison's quadruplex telegraph. After his demonstration of the telegraph, Edison was not sure that his original plan to sell it for $4,000 to $5,000 was right, so he asked Western Union to make a bid. He was surprised to hear them offer $10,000 ($216,300 in today's dollars.[37]), which he gratefully accepted.[38] The quadruplex telegraph was Edison's first big financial success, and Menlo Park became the first institution set up with the specific purpose of producing constant technological innovation and improvement. Edison was legally attributed with most of the inventions produced there, though many employees carried out research and development under his direction. His staff was generally told to carry out his directions in conducting research, and he drove them hard to produce results.

William Joseph Hammer, a consulting electrical engineer, started working for Edison and began his duties as a laboratory assistant in December 1879. He assisted in experiments on the telephone, phonograph, electric railway, iron ore separator, electric lighting, and other developing inventions. However, Hammer worked primarily on the incandescent electric lamp and was put in charge of tests and records on that device (see Hammer Historical Collection of Incandescent Electric Lamps). In 1880, he was appointed chief engineer of the Edison Lamp Works. In his first year, the plant under General Manager Francis Robbins Upton turned out 50,000 lamps. According to Edison, Hammer was "a pioneer of incandescent electric lighting".[39]Frank J. Sprague, a competent mathematician and former naval officer, was recruited by Edward H. Johnson and joined the Edison organization in 1883. One of Sprague's contributions to the Edison Laboratory at Menlo Park was to expand Edison's mathematical methods. Despite the common belief that Edison did not use mathematics, analysis of his notebooks reveal that he was an astute user of mathematical analysis conducted by his assistants such as Francis Robbins Upton, for example, determining the critical parameters of his electric lighting system including lamp resistance by an analysis of Ohm's Law, Joule's Law and economics.[40]

Nearly all of Edison's patents were utility patents, which were protected for a 17-year period and included inventions or processes that are electrical, mechanical, or chemical in nature. About a dozen were design patents, which protect an ornamental design for up to a 14-year period. As in most patents, the inventions he described were improvements over prior art. The phonograph patent, in contrast, was unprecedented as describing the first device to record and reproduce sounds.[41]

In just over a decade, Edison's Menlo Park laboratory had expanded to occupy two city blocks. Edison said he wanted the lab to have "a stock of almost every conceivable material".[42] A newspaper article printed in 1887 reveals the seriousness of his claim, stating the lab contained "eight thousand kinds of chemicals, every kind of screw made, every size of needle, every kind of cord or wire, hair of humans, horses, hogs, cows, rabbits, goats, minx, camels ... silk in every texture, cocoons, various kinds of hoofs, shark's teeth, deer horns, tortoise shell ... cork, resin, varnish and oil, ostrich feathers, a peacock's tail, jet, amber, rubber, all ores ..." and the list goes on.[43]

Over his desk, Edison displayed a placard with Sir Joshua Reynolds' famous quotation: "There is no expedient to which a man will not resort to avoid the real labor of thinking."[44] This slogan was reputedly posted at several other locations throughout the facility.

With Menlo Park, Edison had created the first industrial laboratory concerned with creating knowledge and then controlling its application.[45] Edison's name is registered on 1,093 patents.[25]

Carbon telephone transmitter

In 1876, Edison began work to improve the microphone for telephones (at that time called a "transmitter") by developing a carbon microphone, which consists of two metal plates separated by granules of carbon that would change resistance with the pressure of sound waves. A steady direct current is passed between the plates through the granules and the varying resistance results in a modulation of the current, creating a varying electric current that reproduces the varying pressure of the sound wave.

Up to that point, microphones, such as the ones developed by Johann Philipp Reis and Alexander Graham Bell, worked by generating a weak current. The carbon microphone works by modulating a direct current and, subsequently, using a transformer to transfer the signal so generated to the telephone line. Edison was one of many inventors working on the problem of creating a usable microphone for telephony by having it modulate an electrical current passed through it.[46] His work was concurrent with Emile Berliner's loose-contact carbon transmitter (who lost a later patent case against Edison over the carbon transmitters invention[47]) and David Edward Hughes study and published paper on the physics of loose-contact carbon transmitters (work that Hughes did not bother to patent).[46][48]

Edison used the carbon microphone concept in 1877 to create an improved telephone for Western Union.[47] In 1886, Edison found a way to improve a Bell Telephone microphone, one that used loose-contact ground carbon, with his discovery that it worked far better if the carbon was roasted. This type was put in use in 1890[47] and was used in all telephones along with the Bell receiver until the 1980s.

It should be noted that the frequency response of the carbon microphone is limited to a narrow frequency range (400 Hz to 4000 Hz), and the device may produce significant electrical noise.

Electric light

Main article: Incandescent light bulb

In 1878, Edison began working on a system of electrical illumination, something he hoped could compete with gas and oil based lighting.[49] He began by tackling the problem of creating a long-lasting incandescent lamp, something that would be needed for indoor use. Many earlier inventors had previously devised incandescent lamps, including Alessandro Volta's demonstration of a glowing wire in 1800 and inventions by Henry Woodward and Mathew Evans. Others who developed early and commercially impractical incandescent electric lamps included Humphry Davy, James Bowman Lindsay, Moses G. Farmer,[50]William E. Sawyer, Joseph Swan, and Heinrich Göbel. Some of these early bulbs had such flaws as an extremely short life, high expense to produce, and high electric current drawn, making them difficult to apply on a large scale commercially.[51]:217–218 Edison realized that to connect a series of electric lights to an economically manageable size and using the necessary thickness of copper wire, he would have to develop a lamp that used a low amount of current. This lamp must have high resistance and use relatively low voltage (around 110 volts).[52]

After many experiments, first with carbon filaments and then with platinum and other metals, Edison returned to a carbon filament.[53] The first successful test was on October 22, 1879;[51]:186[54][55][25] it lasted 13.5 hours.[56] Edison continued to improve this design and on November 4, 1879, filed for U.S. patent 223,898 (granted on January 27, 1880) for an electric lamp using "a carbon filament or strip coiled and connected to platina contact wires".[57] This was the first commercially practical incandescent light.[58]

Although the patent described several ways of creating the carbon filament including "cotton and linen thread, wood splints, papers coiled in various ways",[57] it was not until several months after the patent was granted that Edison and his team discovered a carbonizedbamboo filament that could last over 1,200 hours. The idea of using this particular raw material originated from Edison's recalling his examination of a few threads from a bamboo fishing pole while relaxing on the shore of Battle Lake in the present-day state of Wyoming, where he and other members of a scientific team had traveled so that they could clearly observe a total eclipse of the sun on July 29, 1878, from the Continental Divide.[59]

In 1878, Edison formed the Edison Electric Light Company in New York City with several financiers, including J. P. Morgan, Spencer Trask,[60] and the members of the Vanderbilt family. Edison made the first public demonstration of his incandescent light bulb on December 31, 1879, in Menlo Park. It was during this time that he said: "We will make electricity so cheap that only the rich will burn candles."[61]

Henry Villard, president of the Oregon Railroad and Navigation Company, attended Edison's 1879 demonstration. Villard was impressed and requested Edison install his electric lighting system aboard Villard's company's new steamer, the Columbia. Although hesitant at first, Edison agreed to Villard's request. Most of the work was completed in May 1880, and the Columbia went to New York City, where Edison and his personnel installed Columbia's new lighting system. The Columbia was Edison's first commercial application for his incandescent light bulb. The Edison equipment was removed from Columbia in 1895.[62][63][64][65]

Lewis Latimer joined the Edison Electric Light Company in 1884. Latimer had received a patent in January 1881 for the "Process of Manufacturing Carbons", an improved method for the production of carbon filaments for light bulbs. Latimer worked as an engineer, a draftsman and an expert witness in patent litigation on electric lights.[66]

George Westinghouse's company bought Philip Diehl's competing induction lamp patent rights (1882) for $25,000, forcing the holders of the Edison patent to charge a more reasonable rate for the use of the Edison patent rights and lowering the price of the electric lamp.[67]

On October 8, 1883, the US patent office ruled that Edison's patent was based on the work of William E. Sawyer and was, therefore, invalid. Litigation continued for nearly six years, until October 6, 1889, when a judge ruled that Edison's electric light improvement claim for "a filament of carbon of high resistance" was valid.[68] To avoid a possible court battle with Joseph Swan, whose British patent had been awarded a year before Edison's, he and Swan formed a joint company called Ediswan to manufacture and market the invention in Britain.

Mahen Theatre in Brno (in what is now the Czech Republic), opened in 1882, and was the first public building in the world to use Edison's electric lamps. Francis Jehl, Edison's assistant in the invention of the lamp, supervised the installation.[69] In September 2010, a sculpture of three giant light bulbs was erected in Brno, in front of the theatre.[70]

Electric power distribution

After devising a commercially viable electric light bulb on October 21, 1879, Edison developed an electric "utility" to compete with the existing gas light utilities.[71] On December 17, 1880, he founded the Edison Illuminating Company, and during the 1880s, he patented a system for electricity distribution. The company established the first investor-owned electric utility in 1882 on Pearl Street Station, New York City. On September 4, 1882, Edison switched on his Pearl Street generating station's electrical power distribution system, which provided 110 volts direct current (DC) to 59 customers in lower Manhattan.[72]

In January 1882, Edison switched on the first steam-generating power station at Holborn Viaduct in London. The DC supply system provided electricity supplies to street lamps and several private dwellings within a short distance of the station. On January 19, 1883, the first standardized incandescent electric lighting system employing overhead wires began service in Roselle, New Jersey.

War of currents

Main article: War of Currents

As Edison expanded his direct current (DC) power delivery system, he received stiff competition from companies installing alternating current (AC) systems. From the early 1880s AC arc lighting systems for streets and large spaces had been an expanding business in the US. With the development of transformers in Europe and by Westinghouse Electric in the US in 1885–1886, it became possible to transmit AC long distances over thinner and cheaper wires, and "step down" the voltage at the destination for distribution to users. This allowed AC to be used in street lighting and in lighting for small business and domestic customers, the market Edison's patented low voltage DC incandescent lamp system was designed to supply.[73] Edison's DC empire suffered from one of its chief drawbacks: it was suitable only for the high density of customers found in large cities. Edison's DC plants could not deliver electricity to customers more than one mile from the plant, and left a patchwork of unsupplied customers between plants. Small cities and rural areas could not afford an Edison style system at all, leaving a large part of the market without electrical service. AC companies expanded into this gap.

Edison expressed views that AC was unworkable and the high voltages used were dangerous. As George Westinghouse installed his first AC systems in 1886, Thomas Edison struck out personally against his chief rival stating, "Just as certain as death, Westinghouse will kill a customer within six months after he puts in a system of any size. He has got a new thing and it will require a great deal of experimenting to get it working practically."[74] Many reasons have been suggested for Edison's anti-AC stance. One notion is that the inventor could not grasp the more abstract theories behind AC and was trying to avoid developing a system he did not understand. Edison also appeared to have been worried about the high voltage from misinstalled AC systems killing customers and hurting the sales of electric power systems in general.[75] Primary was the fact that Edison Electric based their design on low voltage DC and switching a standard after they had installed over 100 systems was, in Edison's mind, out of the question. By the end of 1887, Edison Electric was losing market share to Westinghouse, who had built 68 AC-based power stations to Edison's 121 DC-based stations. To make matters worse for Edison, the Thomson-Houston Electric Company of Lynn, Massachusetts (another AC-based competitor) built 22 power stations.[76]

Parallel to expanding competition between Edison and the AC companies was rising public furor over a series of deaths in the spring of 1888 caused by pole mounted high voltage alternating current lines. This turned into a media frenzy against high voltage alternating current and the seemingly greedy and callous lighting companies that used it.[77][78] Edison took advantage of the public perception of AC as dangerous, and joined with self-styled New York anti-AC crusader Harold P. Brown in a propaganda campaign, aiding Brown in the public electrocution of animals with AC, and supported legislation to control and severely limit AC installations and voltages (to the point of making it an ineffective power delivery system) in what was now being referred to as a "battle of currents". The development of the electric chair was used in an attempt to portray AC as having a greater lethal potential than DC and smear Westinghouse at the same time via Edison colluding with Brown and Westinghouse's chief AC rival, the Thomson-Houston Electric Company, to make sure the first electric chair was powered by a Westinghouse AC generator.

Thomas Edison's staunch anti-AC tactics were not sitting well with his own stockholders. By the early 1890s, Edison's company was generating much smaller profits than its AC rivals, and the War of Currents would come to an end in 1892 with Edison forced out of controlling his own company. That year, the financier J.P. Morgan engineered a merger of Edison General Electric with Thomson-Houston that put the board of Thomson-Houston in charge of the new company called General Electric. General Electric now controlled three-quarters of the US electrical business and would compete with Westinghouse for the AC market.[79][80]

Other inventions and projects


Edison is credited with designing and producing the first commercially available fluoroscope, a machine that uses X-rays to take radiographs. Until Edison discovered that calcium tungstate fluoroscopy screens produced brighter images than the barium platinocyanide screens originally used by Wilhelm Röntgen, the technology was capable of producing only very faint images.

The fundamental design of Edison's fluoroscope is still in use today, although Edison abandoned the project after nearly losing his own eyesight and seriously injuring his assistant, Clarence Dally. Dally made himself an enthusiastic human guinea pig for the fluoroscopy project and was exposed to a poisonous dose of radiation. He later died of injuries related to the exposure. In 1903, a shaken Edison said: "Don't talk to me about X-rays, I am afraid of them."[81]

Telegraph improvements

The key to Edison's fortunes was telegraphy. With knowledge gained from years of working as a telegraph operator, he learned the basics of electricity. This allowed him to make his early fortune with the stock ticker, the first electricity-based broadcast system. On August 9, 1892, Edison received a patent for a two-way telegraph.

Motion pictures

Edison was also granted a patent for the motion picture camera or "Kinetograph". He did the electromechanical design while his employee W. K. L. Dickson, a photographer, worked on the photographic and optical development. Much of the credit for the invention belongs to Dickson.[51] In 1891, Thomas Edison built a Kinetoscope or peep-hole viewer. This device was installed in penny arcades, where people could watch short, simple films. The kinetograph and kinetoscope were both first publicly exhibited May 20, 1891.[83]

In April 1896, Thomas Armat's Vitascope, manufactured by the Edison factory and marketed in Edison's name, was used to project motion pictures in public screenings in New York City. Later, he exhibited motion pictures with voice soundtrack on cylinder recordings, mechanically synchronized with the film.

Officially the kinetoscope entered Europe when the rich American Businessman Irving T. Bush (1869–1948) bought from the Continental Commerce Company of Frank Z. Maguire and Joseph D. Baucus a dozen machines. Bush placed from October 17, 1894, the first kinetoscopes in London. At the same time, the French company Kinétoscope Edison Michel et Alexis Werner bought these machines for the market in France. In the last three months of 1894, the Continental Commerce Company sold hundreds of kinetoscopes in Europe (i.e. the Netherlands and Italy). In Germany and in Austria-Hungary, the kinetoscope was introduced by the Deutsche-österreichische-Edison-Kinetoscop Gesellschaft, founded by the Ludwig Stollwerck[84] of the Schokoladen-Süsswarenfabrik Stollwerck & Co of Cologne.

The first kinetoscopes arrived in Belgium at the Fairs in early 1895. The Edison's Kinétoscope Français, a Belgian company, was founded in Brussels on January 15, 1895, with the rights to sell the kinetoscopes in Monaco, France and the French colonies. The main investors in this company were Belgian industrialists.[85]

On May 14, 1895, the Edison's Kinétoscope Belge was founded in Brussels. The businessman Ladislas-Victor Lewitzki, living in London but active in Belgium and France, took the initiative in starting this business. He had contacts with Leon Gaumont and the American Mutoscope and Biograph Co. In 1898, he also became a shareholder of the Biograph and Mutoscope Company for France.[85]

Edison's film studio made close to 1,200 films. The majority of the productions were short films showing everything from acrobats to parades to fire calls including titles such as Fred Ott's Sneeze (1894), The Kiss (1896), The Great Train Robbery (1903), Alice's Adventures in Wonderland (1910), and the first Frankenstein film in 1910. In 1903, when the owners of Luna Park, Coney Island announced they would execute Topsy the elephant by strangulation, poisoning, and electrocution (with the electrocution part ultimately killing the elephant), Edison Manufacturing sent a crew to film it, releasing it that same year with the title Electrocuting an Elephant.

As the film business expanded, competing exhibitors routinely copied and exhibited each other's films.[86] To better protect the copyrights on his films, Edison deposited prints of them on long strips of photographic paper with the U.S. copyright office. Many of these paper prints survived longer and in better condition than the actual films of that era.[87]

In 1908, Edison started the Motion Picture Patents Company, which was a conglomerate of nine major film studios (commonly known as the Edison Trust). Thomas Edison was the first honorary fellow of the Acoustical Society of America, which was founded in 1929.

Edison said his favorite movie was The Birth of a Nation. He thought that talkies had "spoiled everything" for him. "There isn't any good acting on the screen. They concentrate on the voice now and have forgotten how to act. I can sense it more than you because I am deaf."[88] His favorite stars were Mary Pickford and Clara Bow.[89]


Starting in the late 1870s, Thomas Edison became interested and involved with mining. High-grade iron ore was scarce on the east coast of the United States and Edison tried to mine low-grade ore. Edison developed a process using rollers and crushers that could pulverize rocks up to 10 tons. The dust was then sent between three giant magnets that would pull the iron ore from the dust. Despite the failure of his mining company, the Edison Ore Milling Company, Edison used some of the materials and equipment to produce cement.[90]

In 1901, Edison visited an industrial exhibition in the Sudbury area in Ontario, Canada and thought nickel and cobalt deposits there could be used in his production of electrical equipment. He returned as a mining prospector and is credited with the original discovery of the Falconbridge ore body. His attempts to mine the ore body were not successful, and he abandoned his mining claim in 1903.[91] A street in Falconbridge, as well as the Edison Building, which served as the head office of Falconbridge Mines, are named for him.


The Edison Storage Battery Company was founded in 1901. With this company Edison exploited his invention of the accumulator. In 1904 already 450 people worked at the company. The first accumulators were produced for electric cars. But there were several defects. Several Customers were complaining about the products. When the capital of the company was spent Edison paid for the company with his private money. Not until 1910 Edison showed a mature product: A Nickel-Iron-Battery with Lye as liquid.


Edison became concerned with America's reliance on foreign supply of rubber and was determined to find a native supply of rubber. He joined Harvey Firestone and Henry Ford (each contributing $25,000) to create the Edison Botanic Research Corp. in 1927 and constructed a laboratory in Fort Myers, Florida the following year. Edison did the majority of the research and planting, sending results and sample rubber residues to his West Orange Lab. Edison employed a two-part Acid-base extraction, to derive latex from the plant material after it was dried and crushed to a powder.[92] After testing 17,000 plant samples, he eventually found an adequate source in the Goldenrod plant.

West Orange and Fort Myers (1886–1931)

Edison moved from Menlo Park after the death of his first wife, Mary, in 1884, and purchased a home known as "Glenmont" in 1886 as a wedding gift for his second wife, Mina, in Llewellyn Park in West Orange, New Jersey. In 1885, Thomas Edison bought property in Fort Myers, Florida, and built what was later called Seminole Lodge as a winter retreat. Edison and Mina spent many winters at their home in Fort Myers, and Edison tried to find a domestic source of natural rubber.[93]

Due to the security concerns around World War I, Edison suggested forming a science and industry committee to provide advice and research to the US military, and he headed the Naval Consulting Board in 1915.[94]

Edison's work on rubber took place largely at his botanic research laboratory in Fort Myers, which has been designated as a National Historic Chemical Landmark.[95] The laboratory was built after Thomas Edison, Henry Ford, and Harvey Firestone pulled together $75,000 to form the Edison Botanical Research Corporation. Initially, only Ford and Firestone were to contribute funds to the project while Edison did all the research. Edison, however, wished to contribute $25,000 as well. After testing over 17,000 plant species, Edison decided on Solidago leavenworthii, also known as Leavenworth's Goldenrod. The plant, which normally grows roughly 3–4 feet tall with a 5% latex yield, was adapted by Edison through cross-breeding to produce plants twice the size and with a latex yield of 12%.[96]

Thomas Edison Jr.'s activities

Wanting to be an inventor, but not having much of an aptitude for it, Thomas Edison's son, Thomas Alva Edison Jr.. became a problem for his father and his father's business. Starting in the 1890s, Thomas Jr. became involved in snake oil products and shady and fraudulent enterprises producing products being sold to the public as "The Latest Edison Discovery". The situation became so bad that Thomas Sr. had to take his son to court to stop the practices, finally agreeing to pay Thomas Jr. an allowance of $35.00 (equivalent to $953 in 2017[37]) per week, in exchange for not using the Edison name; the son began using aliases, such as Burton Willard. Thomas Jr., suffering from alcoholism, depression and ill health, worked at several menial jobs, but by 1931 (towards the end of his life) he would obtain a role in the Edison company, thanks to the intervention of his brother.[97][98]

Final years

Henry Ford, the automobile magnate, later lived a few hundred feet away from Edison at his winter retreat in Fort Myers. Ford once worked as an engineer for the Edison Illuminating Company of Detroit and met Edison at a convention of affiliated Edison illuminating companies in Brooklyn, NY in 1896. Edison was impressed with Ford's internal combustion engine automobile and encouraged its developments. They were friends until Edison's death. Edison and Ford undertook annual motor camping trips from 1914 to 1924. Harvey Firestone and John Burroughs also participated.

In 1928, Edison joined the Fort Myers Civitan Club. He believed strongly in the organization, writing that "The Civitan Club is doing things—big things—for the community, state, and nation, and I certainly consider it an honor to be numbered in its ranks."[99] He was an active member in the club until his death, sometimes bringing Henry Ford to the club's meetings.

Edison was active in business right up to the end. Just months before his death, the Lackawanna Railroad inaugurated suburban electric train service from Hoboken to Montclair, Dover, and Gladstone, New Jersey. Electrical transmission for this service was by means of an overhead catenary system using direct current, which Edison had championed. Despite his frail condition, Edison was at the throttle of the first electric MU (Multiple-Unit) train to depart Lackawanna Terminal in Hoboken in September 1930, driving the train the first mile through Hoboken yard on its way to South Orange.[100]

This fleet of cars would serve commuters in northern New Jersey for the next 54 years until their retirement in 1984. A plaque commemorating Edison's inaugural ride can be seen today in the waiting room of Lackawanna Terminal in Hoboken, which is presently operated by New Jersey Transit.[100]

Edison was said to have been influenced by a popular fad diet in his last few years; "the only liquid he consumed was a pint of milk every three hours".[51] He is reported to have believed this diet would restore his health. However, this tale is doubtful. In 1930, the year before Edison died, Mina said in an interview about him, "correct eating is one of his greatest hobbies." She also said that during one of his periodic "great scientific adventures", Edison would be up at 7:00, have breakfast at 8:00, and be rarely home for lunch or dinner, implying that he continued to have all three.[88]

Edison became the owner of his Milan, Ohio, birthplace in 1906. On his last visit, in 1923, he was reportedly shocked to find his old home still lit by lamps and candles.[citation needed]


Edison died of complications of diabetes on October 18, 1931, in his home, "Glenmont" in Llewellyn Park in West Orange, New Jersey, which he had purchased in 1886 as a wedding gift for Mina. He is buried behind the home.[101][102]

Edison's last breath is reportedly contained in a test tube at The Henry Ford museum near Detroit. Ford reportedly convinced Charles Edison to seal a test tube of air in the inventor's room shortly after his death, as a memento.[103] A plaster death mask and casts of Edison's hands were also made.[104] Mina died in 1947.

Views on politics, religion, and metaphysics

Historian Paul Israel has characterized Edison as a "freethinker".[51] Edison was heavily influenced by Thomas Paine's The Age of Reason.[51] Edison defended Paine's "scientific deism", saying, "He has been called an atheist, but atheist he was not. Paine believed in a supreme intelligence, as representing the idea which other men often express by the name of deity."[51] In an October 2, 1910, interview in the New York Times Magazine, Edison stated:

Nature is what we know. We do not know the gods of religions. And nature is not kind, or merciful, or loving. If God made me — the fabled God of the three qualities of which I spoke: mercy, kindness, love — He also made the fish I catch and eat. And where do His mercy, kindness, and love for that fish come in? No; nature made us — nature did it all — not the gods of the religions.[105]

Edison was accused of being an atheist for those remarks, and although he did not allow himself to be drawn into the controversy publicly, he clarified himself in a private letter:

You have misunderstood the whole article, because you jumped to the conclusion that it denies the existence of God. There is no such denial, what you call God I call Nature, the Supreme intelligence that rules matter. All the article states is that it is doubtful in my opinion if our intelligence or soul or whatever one may call it lives hereafter as an entity or disperses back again from whence it came, scattered amongst the cells of which we are made.[51]

He also stated, "I do not believe in the God of the theologians; but that there is a Supreme Intelligence I do not doubt."[106]


Mina Miller Edison in 1906
Photograph of Edison with his phonograph (2nd model), taken in Mathew Brady's Washington, DC studio in April 1878.
Edison's Menlo Park Laboratory, reconstructed at Greenfield Village at Henry Ford Museum in Dearborn, Michigan.
Thomas Edison's first successful light bulb model, used in public demonstration at Menlo Park, December 1879
U.S. Patent#223898: Electric-Lamp. Issued January 27, 1880.
The June 1894 Leonard–Cushing bout. Each of the six one-minute rounds recorded by the Kinetoscope was made available to exhibitors for $22.50.[82] Customers who watched the final round saw Leonard score a knockdown.
A Day with Thomas Edison (1922)
Share of the Edison Storage Battery Company, issued 19. October 1903
From left to right: Henry Ford, Thomas Edison, and Harvey Firestone, the three partners of the Edison Botanic Research Corporation.
Thomas A. Edison Industries Exhibit, Primary Battery section, 1915

බූන්දි නව ඊමේල් ලිපිනය



එක් මිනිසෙක් බුද්ධ හමු වී මෙසේ කිවුවා.
"මට සතුට අවශ්‍යයි!"

එවිට බුද්ධ කීවා;
"මුලින්ම මට යන්න ඉවත් කරන්න. ඒ මමත්වයයි.
ඉන්පසු, අවශ්‍යයි යන්න ඉවත් කරන්න. ඒ තෘෂ්ණාවයි.... [More]

What's New | අලුතෙන්ම

අදහස්| කාලෝ අයංතේ

(මහේෂි බී. වීරකෝන්) වර්තමානයෙහි සිදු වූ හා සිදුවෙමින් පවතින සිද්ධීන් සියල්ල ලාංකීය සමාජය අධ්‍යාපනික, මානූෂීය හා බුද්ධිමය වශයෙන් අසාර්ථක වී ඇති බව නැවත... [More]

අදහස්| [සරදගේ ලියුං හැකින්ස්]- හීන දෙවියන්වහන්සේගෙන් ලියුමක්!

හීන කියන්නේ හරි අපූරු දෙයක් උනත් හීන දැක දැක නිදියෑමේ වාසනාව හැමෝටම නෑ. එකට ඉතිං හීන දෙවියන්ගේ ඇල්ම බැල්ම ලැබීමේ... [More]

කතන්දර| "මිස් උඩුකුරුඤ්ඤං!"- ළමා කතන්දරය [වීඩියෝව]

"මිස් උඩුකුරුඤ්ඤං!"- හැම පොඩිත්තෙක්ම නැරඹිය යුතු අපූරු කතන්දරයක් [කාටූන්]- Roxana Bouwer ලියා, Sarah Bouwer සිත්තම් කළ "Why Is Nita Upside... [More]

වෙසෙස්| ඡ්‍යෝතිෂය පදනම්වන්නේ ව්‍යාජ දෘශ්‍ය මායාවක් මතය!

(තාරක වරාපිටිය) ඡ්‍යෝතිෂයේ ඇති මුලික මිත්‍යාව නම් "පෙනෙන අහස සත්‍යයකි" යන්නයි. අපට පෙනෙන අහස යනු ග්‍රහ වස්තූන් වල ඇත්ත පිහිටීම නොවේ. අනෙක්... [More]

වෙසෙස්| අරාබි සාහිත්‍යයේ ඛලීල් සලකුණ

(ඩිල්ෂානි චතුරිකා දාබරේ) උපදේශ සාහිත්‍යයේ පෙරදිග ලකුණ සනිටුහන් කිරිමෙහිලා පුරෝගාමී වූ ලේඛක ප්‍රජාවක් පිළිබඳව කරුණු සාහිත ලොව සුලබ වුවත්, එය අපරදිග හා මුසුකිරීමෙහි... [More]

වෙසෙස්| පශ්චාත් සත්‍ය යුගයේ ජනමාධ්‍යයේ කාර්යභාරය අවසන්ද?

(සරද සමරසිංහ) ජනමාධ්‍යයේ පදනම වන සත්‍යය එළිදරවු කිරීමට යෑමේදී ඝාතනයට ලක්වුනු රිචඩ් ද සොයිසා නොමැතිව ලංකාවේ ජනමාධ්‍ය වසර 18ක් පමණ ‘පරණ’ වී... [More]

කවි| ඔබ

(මහේෂ් මුණසිංහ) (සැත්කමකින් අනතුරුව පුද්ගලයෙකුගේ මතකය මිනිත්තු 90 කට සීමා වේ.)

වෙළී වෙළී තැවරෙයි.
යනවා වුණත් යන්නට හැකි
කාලාවධිය කෙටියි... [More]

ඔත්තු| නුඹ සුළං රැල්ලක්ව- පෙබරවාරි 17

නිශාන්ත ෆර්නෑන්ඩුගේ පළමු කාව්‍ය සංග්‍රහය "නුඹ සුළං රැල්ලක්ව", 2017 පෙබරවාරි 17 වැනිදා සවස 3:00ට, මහවැලි... [More]

අදහස්| සිරිසේන සිදාදි එනවද, සිංහලේම ඉන්නවද?

(ඥානසිරි කොත්තිගොඩ) යහපාලන ආණ්ඩුව ඉවරද​? අගමැති වෙනස් වෙයිද​? එජාප නායකකම රනිල්ට අහිමි වේවිද​? මහින්ද අගමැති වේවිද​? මේ දිනවල ජනතාව අතර වැඩිපුර... [More]

අදහස්| පැ ර දු නේ ක වු ද ?

(නැදිමාලේ Miniහෙක්) මැතිවරණයක ජය පරාජය තමන් කැමති ඕනෑම රසකාරක අනුපාන හෝ තිත්ත අබිං දමා විග්‍රහ කර ගැනීම ඕනෑම පක්ෂයකට පුද්ගලයෙකුට කාගෙන්වත් බාධාවක්... [More]

අදහස්| [සරදගේ ලියුං හැකින්ස්]- 'මියන් කුමරා' අලි පැටියාට මියන්මාරයෙන් ලියුමක්

බෙල්ලන්විල හාමුදුරුවන්ව අපවත් කළ මියන්මාරයෙන් ගෙනෙන ලද ඇත් පැටියාට මියන්මාරයෙන් අවතැන් වීමට සිදුවී ඇති රෝහින්ග්‍යා සරණාගත පවුලක ළමයෙක් ලියුමක් එවලා.... [More]

කතන්දර| "ඇඳ යට කොටියෙක්"- ළමා කතන්දරය [වීඩියෝව]

"ඇඳ යට කොටියෙක්"- පොඩිත්තන්ට විනෝදාත්මක කතන්දරයක් [කාටූන්]- Anupa Lal ලියා, Suvidha Mistry සිත්තම් කළ "Under My Bed" ළමා කතන්දරයේ සිංහල... [More]

කවි| සදාතනික සිසු විරුවාණෙනි, මම නුඹේ ප්‍රේමවන්තිය වෙමි!

(සාරධිකා මංජරී හේරත්) වසන්තේ මල් පිපී තිබුනලු
අවාරෙට රඟහලේ තනියට
හන්තාන අළු වෙලා බෝ කල්
පුරුදු ලෙස ගිම්හාන සුළඟට
නුඹත් මේ සඳ දකිනවා ඇති
ප්‍රේම හැඟුමන් මතෙන් නලියන... [More]

Cine| ලාංකේය සිනමාව වාණිජවාදී විනෝදායන කර්මාන්තයක් වීම හා ධර්මසේන පතිරාජගේ ප්‍රේක්ෂාගාරය

කතන්දර| "සිංහ කොඩියෙ කතන්දරේ" සිංහයා කියා දෙයි! [වීඩියෝව]

අපේ ජාතික කොඩිය සහ එහි ඉතිහාසය ගැන පොඩිත්තන්ට කියාදෙන- "සිංහ කොඩියෙ කතන්දරේ"- [කාටූන්]

හඬ- මාෂා සුවනී, නයෝමි ගුණසිරි
පිටපත සහ සජීවීකරණය- බූන්දි... [More]

කතා-බස්| "බොහෝ ලේඛකයන් බයයි ඇත්ත කථාකරන්න!"- අශෝක හඳගම සමග කතාබහක්

අදහස්| [සරදගේ ලියුං හැකින්ස්]- එඩ්වඩ් කුමාරයාගෙන් එංගලන්තේ මහරැජීනට ලියුමක්

ලංකාවේ නිදහස් උළෙලට සපෝට් එකක් දෙන්න මේ දවස්වල ලංකාවට ඇවිල්ල ඉන්න එංගලන්තේ මහ රාජිනීන්වහන්සේගේ දෙවෙනි පුත්‍ර රත්නය වන එඩ්වඩ් කුමාරයාණන්වහන්සේ... [More]

BoondiLets| බර්ටොල්ට් බ්‍රෙෂ්ට් කියයි.

බැංකු මංකොල්ල කන්නේ ආධුනික හොරුන්ය. නියම වෘත්තීය හොරුන් කරන්නේ අලුතෙන් බැංකුවක් පිහිටුවීමය!

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