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Elisha Gray
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Elisha Gray (August 2, 1835 – January 21, 1901) was an American electrical engineer and is best known for his development of a telephone prototype in 1876 in Highland Park, Illinois, U.S.A. and is considered by many to be the true inventor of the variable resistance telephone. Despite losing out to Alexander Graham Bell for the telephone, Gray was awarded over 70 patents for his inventions..
into a Quaker family in Barnesville, Ohio, Gray was brought up on a farm.
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Elisha Gray (August 2, 1835 – January 21, 1901) was an American electrical engineer and is best known for his development of a telephone prototype in 1876 in Highland Park, Illinois, U.S.A. and is considered by many to be the true inventor of the variable resistance telephone. Despite losing out to Alexander Graham Bell for the telephone, Gray was awarded over 70 patents for his inventions..
Biography and early inventions
Born into a Quaker family in Barnesville, Ohio, Gray was brought up on a farm. He spent several years at Oberlin College where he experimented with electrical devices. Although Gray was not a graduate of Oberlin College, he taught electricity and science at Oberlin and built laboratory equipment for Oberlin science departments.
In 1862 while at Oberlin, Gray met and married Delia Minerva Shepard.
In 1865 Gray invented a self-adjusting telegraph relay that automatically adapted to varying insulation of the telegraph line.
In 1867 Gray received a patent for the self-adjusting telegraph relay and in later years he received patents for more than 70 other inventions.
In 1869, Elisha Gray and his partner Enos M. Barton founded Gray & Barton Co. in Cleveland, Ohio to supply telegraph equipment to the giant Western Union Telegraph Company. The electrical distribution business was later spun off from Western Electric and organized into a separate company, Graybar Electric Company, Inc.. Barton had been employed by Western Union to examine and test new products.
In 1870 financing for Gray & Barton Co. was arranged by General Anson Stager, a superintendent of the Western Union Telegraph Company. Stager became an active partner in Gray & Barton Co., which moved to Chicago. Gray moved from Ohio to Highland Park near Chicago and remained on the board of directors. But he gave up his administrative position as chief engineer to focus on inventions that could benefit the telegraph industry. Gray's inventions and patent costs were financed by a dentist, Dr. Samuel S. White of Philadelphia, who had made a fortune producing porcelain teeth. White wanted Gray to focus on the acoustic telegraph which promised huge profits to the exclusion of what appeared to be unpromising competing inventions such as the telephone. It was White's decision in 1876 to abandon Gray's caveat for the telephone.
In 1870, Gray developed a needle annunciator for hotels and another for elevators. He also developed a telegraph printer which had a typewriter keyboard and printed messages on paper tape.
In 1872 Western Union, then financed by the Vanderbilts and J. P. Morgan, bought one-third of Gray and Barton Co. and changed the name to Western Electric Manufacturing Company of Chicago. Gray continued to invent for Western Electric.
In 1874, Gray retired to do independent research and development. Gray applied for a patent on a harmonic telegraph which consisted of multi-tone transmitters, each tone being controlled by a separate telegraph key. Gray gave several private demonstrations of this invention in New York and Washington, D.C. in May and June 1874.
Gray was a charter member of the . At the church, on December 29, 1874, Gray gave the first public demonstration of his invention for transmitting musical tones and transmitted "familiar melodies through telegraph wire" according to a newspaper announcement. This was the first electric music synthesizer using self vibrating electromagnetic circuits that were single-note oscillators operated by a two-octave piano keyboard. The "Musical Telegraph" used steel reeds whose oscillations were created by electromagnets and transmitted over a telegraph wire. Gray also built a simple loudspeaker in later models consisting of a vibrating diaphragm in a magnetic field to make the oscillator tones audible and louder at the receiving end.
On July 27th, 1875, Gray was granted patent 166,096 for "Electric Telegraph for Transmitting Musical Tones" (the acoustic telegraph).
Elisha Gray and the telephone
Because of Samuel White's opposition to Gray working on the telephone, Gray did not tell anybody about his new invention for transmitting voice sounds until Friday 11 February 1876 when Gray requested that his patent lawyer William D. Baldwin prepare a "caveat" for filing at the US Patent Office. A caveat was like a provisional patent application with drawings and description but without claims.
On the morning of Monday 14 February 1876, Gray signed and had notarized the caveat that described a telephone that used a liquid microphone. Baldwin then submitted the caveat to the US Patent Office. That same morning a lawyer for Alexander Graham Bell submitted Bell's patent application.
Which application arrived first is hotly disputed, although the most recent evidence suggest Gray's caveat arrived a few hours before Bell's application. Bell's lawyers in Washington, DC had been waiting with Bell's patent application for months, under instructions not to file it until it had been filed in Britain first. (At the time, Britain would only issue patents on discoveries not previously patented elsewhere.)
During the weekend of February 12-14, 1876, before either caveat or application had been filed in the patent office, Bell's lawyer learned about the liquid transmitter idea in Gray's caveat that would be filed early Monday morning February 14. Bell's lawyer then added seven sentences describing the liquid transmitter and a variable resistance claim to Bell's draft application. After the lawyer's clerk recopied the draft as a finished patent application, Bell's lawyer hand-delivered the finished application to the patent office just before noon on Monday, a few hours after Gray's caveat was delivered to the patent office by Gray's lawyer. Bell's lawyer requested that Bell's application be immediately recorded and hand-delivered to the examiner on Monday so that later Bell could claim it had arrived first. Bell was in Boston at this time and was not aware that his application had been filed in the US patent office.
Five days later, on February 19, Zenas Fisk Wilber, the patent examiner for both Bell's application and Gray's caveat, noticed that Bell's application claimed the same variable resistance feature described in Gray's caveat. Wilber declared an interference that would delay Bell's application until Bell submitted proof, under the first to invent rules, that Bell had invented that feature before Gray. Bell's lawyer telegraphed Bell, who was still in Boston, to come to Washington DC. When Bell arrived on February 26, Bell visited his lawyers and then visited examiner Wilber who told Bell that Gray's caveat showed a liquid transmitter and asked Bell for proof that the liquid transmitter idea (described in Bell's patent application as using mercury as the liquid) was invented by Bell. Bell pointed to an application of Bell's filed a year earlier where mercury was used in a circuit breaker. The examiner accepted this argument, although mercury would not have worked in a telephone transmitter. On March 3, Wilber approved Bell's application and on March 7, 1876 patent 174,465 was published by the U.S. Patent Office.
Bell returned to Boston and resumed work on February 9, drawing a diagram in his lab notebook of a water transmitter being used face down and very similar to that shown in Gray's caveat." Bell and Watson built and tested Gray's water transmitter design on 10 March and successfully transmitted clear speech saying "Mr. Watson -- come here -- I want to see you." Bell's notebooks did not become public until the 1990s.
The importance of Bell's test of Gray's water transmitter idea was it provided "proof of concept" that clear speech could be transmitted electrically. It was a scientific experiment, not development of a commercial product. Prior to that, Bell had only an unproven theory. Bell and Watson then resumed experiments to improve the electromagnetic transmitter. When Bell demonstrated his telephone at the Centennial Exhibition in June 1876, he used his improved electromagnetic transmitter that transmitted clear speech.
Although Gray had abandoned his caveat, Gray applied for a patent for the same invention in late 1877. This put him in a second interference with Bell's patents. The Patent Office determined "while Gray was undoubtedly the first to conceive of and disclose the [variable resistance] invention, as in his caveat of 14 February 1876, his failure to take any action amounting to completion until others had demonstrated the utility of the invention deprives him of the right to have it considered." Gray challenged Bell's patent anyway, and after two years of litigation, Bell was awarded rights to the invention, and as a result, Bell is credited as the inventor.
In 1886, Wilber stated in a sworn affidavit that he was an alcoholic and deeply in debt to Bell's lawyer Marcellus Bailey with whom Wilber had served in the Civil War. Wilber stated that, contrary to Patent Office rules, he showed Bailey the caveat Gray had filed. Wilber also stated that he showed the caveat to Bell and Bell gave him $100. Bell testified that they only discussed the patent in general terms, although in a letter to Gray, Bell admitted that he learned some of the technical details. However, none of these visits between Bell and the examiner could have taken place before Bell's application was filed on February 14, because Bell did not arrive in Washington DC until February 26.
Bell's patent was still disputed because there had been rumors that the patent examiner allowed Bell to see Gray's caveat and allowed Bell or his lawyer to add a handwritten margin note describing an alternate design identical to Gray's liquid microphone design. However, the handwritten margin note was added only to Bell's earlier draft, not as a marginal addition to his patent application that shows no such marginal additions. Bell or his lawyer could not have added the 7 sentences to the application after Bell's patent was filed in the patent office, because then there would not have been any interference on February 19. The courts rejected this conspiracy argument because Bell's original application had no such additions in the margin, and the material in question initially resulted in a finding of interference against Bell.
Gray's further inventions
In 1887 Gray invented the "telautograph", a device that could remotely transmit handwriting through telegraph systems. Gray was granted several patents for these pioneer fax machines, and the Gray National Telautograph Company was charted in 1888 and continued in business as The Telautograph Corporation for many years; after a series of mergers it was finally absorbed by Xerox in the 1990s. Gray's telautograph machines were used by banks for signing documents at a distance and by the military for sending written commands during gun tests when the deafening noise from the guns made spoken orders on the telephone impractical. The machines were also used at train stations for schedule changes.
Gray displayed his telautograph invention in 1893 at the 1893 Columbian Exposition and sold his share in the telautograph shortly after that. Gray was also chairman of the International Congress of Electricians at the World's Columbian Exposition of 1893.
Gray conceived of a primitive closed-circuit television system that he called the "telephote". Pictures would be focused on an array of selenium cells and signals from the selenium cells would be transmitted to a distant station on separate wires. At the receiving end each wire would open or close a shutter to recreate the image.
In 1899 Gray moved to Boston where he continued inventing. One of his projects was to develop an underwater signaling device to transmit messages to ships. One such signaling device was tested on December 31, 1900. Three weeks later, on January 21, 1901, Gray died from a heart attack in Newtonville, Massachusetts.
As of 2006 no book-length biography has been written about the life of Elisha Gray. An Oberlin physics department head named Dr. Lloyd W. Taylor began writing a Gray biography, but the book was never finished because of Taylor's accidental death in July 1948. Dr Taylor's unfinished manuscript is in the College Archives at Oberlin College.
Gray's publications
Gray wrote several books including:
- Experimental Researches in Electro-Harmonic Telegraphy and Telephony, 1867-1876 (Appleton, 1878)
- Telegraphy and Telephony (1878)
- Electricity and Magnetism (1900) and
- Nature's Miracles (1900) a nontechnical discussion of science and technology for the general public.
See also
External links
- filed on February 14, 1876 same day as Bell's application
- with drawings, filed on February 14, 1876
- of 1876
- over the harmonic telegraph
- description
- in Rosehill Cemetery, Chicago
Gray's Patents
Patent images in TIFF format
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