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Thomas Edison

Thomas Alva Edison (February 11, 1847October 18, 1931) was an American inventor and businessman who developed many important devices. "The Wizard of Menlo Park" was one of the first inventors to apply the principles of mass production to the process of invention.

Edison is considered one of the most prolific inventors of his time, holding a record 1,093 patents in his name. Most of these inventions were not completely original but improvements of earlier patents, and were actually made by his numerous employees - Edison was frequently criticized for not sharing the credits. Nevertheless, Edison received patents worldwide, including the United States, United Kingdom, France, and Germany. Edison started the Motion Picture Patents Company, which was a conglomerate of nine major film studios (commonly known as the Edison Trust).

In the early 1900's, Thomas Edison bought a house in Fort Myers, Florida (Seminole Lodge) as a winter retreat. Henry Ford, the automobile magnate lived across the street at his winter retreat (The Mangoes). They were friends until Edison died.


Early years

Thomas Edison was born in Milan, Ohio and grew up in Port Huron, Michigan. Partially deaf since adolescence, he became a telegraph operator in the 1860s, and a famously fast one. Some of his earliest inventions related to electrical telegraphy, including a stock ticker.

Edison spent a time in his youth selling snacks and candy on the railroad. He also worked as a pig slaughterer and started a business selling vegetables. He could reputedly guess a man's weight correctly by simply looking at him. Around 1862, Edison printed and published The Weekly Herald . It was the first newspaper typeset and printed on a moving train. The Port Huron Times-Herald featured a story on Edison and his paper. Edison applied for his first patent, the electric vote recorder, on October 28, 1868.

Middle years

Thomas Edison began his career as an inventor in Newark, New Jersey with the stockticker and other improved telegraphic devices, but the invention which first gained Edison wide fame was the phonograph in 1877. While non-reproducible sound recording was first achieved by Leon Scott de Martinville (France, 1857), and others at the time (notably Charles Cros) were contemplating the notion that sound waves might be recorded and reproduced, Edison was the first to publicly demonstrate a device to do so. This accomplishment was so unexpected by the public at large as to appear almost magical. Edison became known as "The Wizard of Menlo Park" after the New Jersey town where he resided). His first phonograph recorded onto tinfoil cylinders had low sound quality and destroyed the track during replay so that one could listen only once. A redesigned model using wax cylinders was produced soon after by Alexander Graham Bell. Sound quality was still low, and replays were limited before wear destroyed the recording, but the invention enjoyed popularity. The "gramophone", playing gramophone records, was invented by Emile Berliner in 1887, but in the early years, the audio fidelity was worse than the phonograph cylinders marketed by Edison Records.

Menlo Park

Edison's major innovation was the Menlo Park research lab, which was built in New Jersey. It was the first institution set up with the specific purpose of producing constant technological innovation and improvement. Edison was the inventor of most of the inventions produced there, though he primarily supervised the operation and work of his employees.

Most of Edison's patents were utility patents, with only about a dozen being design patents. Many of his inventions were not completely original, but improvements which allowed for mass production. For example, contrary to public perception, Edison did not invent the electric light bulb. Several designs had already been developed by earlier inventors including Joseph Swan, Henry Woodward, Mathew Evans, James Bowman Lindsay, William Sawyer , and Heinrich Göbel. In 1878, Edison applied the term filament to the element of glowing wire carrying the current, although English inventor Joseph Swan used the term prior to this. Edison took the features of these earlier designs and set his workers to the task of creating longer-lasting bulbs. After Edison purchased the Woodward and Evans patent of 1875, his employees experimented with a large number of different materials to increase the bulb's burning time. By 1879, they had increasied the burning time enough to make the light bulb commercially viable. While the earlier inventors had produced electric lighting in laboratory conditions, Edison concentrated on commercial application and was able to sell the concept to homes and businesses by mass-producing relatively long-lasting light bulbs and creating a system for the generation and distribution of electricity.

The Menlo Park research lab was made possible by the sale of the quadruplex telegraph that Edison invented in 1874. The quadruplex telegraph could send four simultaneous telegraph signals over the same wire. When Edison asked Western Union to make an offer, he was shocked at the unexpectedly large amount that Western Union offered; the patent rights were sold for $10,000. The quadruplex telegraph was Edison's first big financial success.

Incandescence era

US223898 Electric Lamp

In 1878, Edison formed Edison Electric Light Company in New York City with several financiers, including J.P. Morgan and the Vanderbilts. Edison made the first public demonstration of incandescent lighting on December 31, 1879, in Menlo Park. On January 27, 1880, he filed a patent in the United States for the electric incandescent lamp.

On October 8, 1883, the U.S. patent office ruled that Edison's patent was based on the work of William Sawyer and was invalid. Litigation continued 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. After losing a court battle with Joseph Swan, they formed a joint company (Ediswan) to market the invention. This company and its technological heritage became General Electric in 1892.

In 1880, Edison patented a electric distribution system. The first investor-owned electric utility was the 1882 Pearl Street Station, New York City. On January 25, 1881, Edison and Alexander Graham Bell formed the Oriental Telephone Company. On September 4, 1882, Edison switched on the world's first electrical power distribution system, providing 110 volts direct current (DC) to 59 customers in lower Manhattan, around his Pearl Street laboratory. On January 19, 1883, the first standardized electric lighting system employing overhead wires began service in Roselle, New Jersey.

Extravagant displays of electric lights quickly became a feature of public events, as this picture from the 1897 Tennessee Centennial Exposition shows.
Extravagant displays of electric lights quickly became a feature of public events, as this picture from the 1897 Tennessee Centennial Exposition shows.

War of Currents era

Main article:War of Currents

During the initial years of electricity distribution, Edison's DC was the standard for the United States, and Edison was not disposed to lose all his patent royalties. During the "War of Currents" era, Serbian immigrant Nikola Tesla and Edison became adversaries due to Edison's promotion of DC for electric power distribution over the more efficient alternating current (AC) advocated by Tesla, who patented AC in Graz, Austria. Edison (or, reportedly, one of his employees) employed the tactics of misusing Tesla's patents to construct the first electric chair for the state of New York to promote the idea that AC was deadly. Popular myth has it that Edison invented the electric chair, despite being against capital punishment, solely as a means of impressing the public that AC was more dangerous than DC. In fact, like most of the output of the Menlo Park operations, the chair was primarily invented by a few of his employees, in particular Harold P. Brown, while Edison supervised their operations. [1]

Edison went on to carry out a campaign to discredit and discourage the use of AC. Edison presided personally over several electrocutions of animals, primarily stray cats and dogs, for the benefit of the press to prove that his system of DC was safer than that of AC. Edison's series of animal executions peaked with the electrocution of Topsy the Elephant.

Many of Edison's inventions using DC ultimately lost to AC devices proposed by others. AC distribution systems replaced DC, enormously extending the range and improving the safety and efficiency of power distribution. Since the 1950s, high voltage direct current (HVDC) transmission systems have become more common in certain situations.

Work relations

As exemplified by the light bulb, most of Edison's inventions were improvements of ideas by others, achieved through a diligent and industrial approach and team-based development. He was the undisputed head of the team, but usually did not share credit for the inventions. He himself said: "genius is one percent inspiration, ninety-nine percent perspiration." Nikola Tesla, possibly Edison's most famous employee who went on to be a great scientist and inventor in his own right, said about Edison's method of problem-solving: "If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found the object of his search. I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety percent of his labor."

Frank J. Sprague, a former naval officer, was recruited by Edward H. Johnson, and joined the Edison organization in 1883. Sprague was a good mathematician, and one of Sprague's significant contributions to the Edison Laboratory at Menlo Park was the introduction of mathematical methods. Prior to his arrival, Edison conducted many costly trial-and-error experiments. Sprague's approach was to calculate the optimum parameters and thus save much needless tinkering. He did important work for Edison, including correcting Edison's system of mains and feeders for central station distribution. In 1884, Sprague decided his interests in the exploitation of electricity lay elsewhere, and he left Edison to found the Sprague Electric Railway & Motor Company. However, Sprague, who later developed many electrical innovations, always credited Edison for their work together.

Media inventions

Edison holds the patent for the motion picture camera, but it is argued that William Kennedy Laurie Dickson actually invented it while working in the Menlo Park research lab. As with the electric light, an improvement upon ideas developed by others. Edison established the standard of using 35 mm (then 1 and 3/8 inches) film with 4 perforations on the edge of each frame that allowed film to emerge as a mass medium. He built what has been called the first movie studio, the Black Maria, in New Jersey. There, he made the first copyrighted film, Fred Ott's Sneeze. In 1902, a US court rejected Edison's claim that he be granted sole rights over all aspects of movie production in the case "Edison v. American Mutoscope Company" [2].

In 1894, Edison experimented with synchronizing audio with film; the Kinetophone loosely synchronized a Kinetoscope image with a cylinder phonograph. In April of 1896, Edison and Thomas Armat's Vitascope was used to project motion pictures in public screenings in New York City.

His contributions to technology benefited people world-wide, and in 1878, he was named Chevalier of the Legion of Honor of France, and in 1889 was made a Commander in the Legion of Honor.

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. This was especially important to Thomas Edison because he had been searching for a way to entertain customers that were listening to music on his phonograph. Now, people could go to a penny arcade, put in a coin, put on the headphones, and watch a film through the peep-hole. Later that same year, on December 29, Edison patented the radio.

On August 9, 1892, Edison received a patent for a two-way telegraph.

Later years

Thomas Edison submitted his last patent application, "Holder for Article to be Electroplated", on January 6, 1931 and died later that year. The patent was granted two years later in 1933.

Personal life

Thomas Edison was an atheist. He was married twice, the first time in 1871 to Mary Stilwell (1855-1884), with whom he had three children—Marion Estelle, Thomas Jr., and William Leslie—before she died at age 29, probably of typhoid fever. His second marriage was to Mina Miller (1865-1946), also with three children, Madeleine , Charles (who took over the company), and Theodore Miller . He purchased a home known as Glenmont in 1886 as a wedding gift for Mina in West Orange, New Jersey. The remains of Thomas and Mina Edison are now buried there. The 13.5 acre (55,000 m²) property is maintained by the National Park Service as the Edison National Historical Site .

List of contributions

For a discussion of Edison's Record company and its role in the recording industry, see: Edison Records. See also incandescent light bulb.

Improvements of Edison's work


The town of Edison, New Jersey, and Thomas Edison State College, a nationally-known college for adult learners in Trenton, New Jersey, are named for the inventor. There is a Thomas Alva Edison Memorial Tower and Museum in the town of Edison.

Life magazine (USA), in a special double issue, placed Edison first in the "100 Most Important People in the Last 1000 Years", noting that his light bulb "lit up the world".

The City Hotel, in Sunbury, Pennsylvania, was the first building to be lit with Edison's three-wire system. The hotel was renamed The Hotel Edison, and retains that name today.

External links


Historic sites



Writings and speech

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