Elisha Gray

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Elisha Gray
Portrait elisha gray.jpg
Born(1835-08-02)August 2, 1835
DiedJanuary 21, 1901(1901-01-21) (aged 65)
Awards Elliott Cresson Medal (1897)

Elisha Gray (August 2, 1835 – January 21, 1901) was an American electrical engineer who co-founded the Western Electric Manufacturing Company. Gray is best known for his development of a telephone prototype in 1876 in Highland Park, Illinois. Some recent authors have argued that Gray should be considered the true inventor of the telephone because Alexander Graham Bell allegedly stole the idea of the liquid transmitter from him, [1] although Gray had been using liquid transmitters in his telephone experiments for more than two years previously. Bell's telephone patent was upheld in numerous court decisions.

Electrical engineering field of engineering that deals with electricity

Electrical engineering is a professional engineering discipline that generally deals with the study and application of electricity, electronics, and electromagnetism. This field first became an identifiable occupation in the later half of the 19th century after commercialization of the electric telegraph, the telephone, and electric power distribution and use. Subsequently, broadcasting and recording media made electronics part of daily life. The invention of the transistor, and later the integrated circuit, brought down the cost of electronics to the point they can be used in almost any household object.

Western Electric Company was an American electrical engineering and manufacturing company that served as the primary supplier to AT&T from 1881 to 1996, and to the local Bell Operating Companies until 1984. The company was responsible for many technological innovations and seminal developments in industrial management. It also served as the purchasing agent for the member companies of the Bell System.

Invention of the telephone

The invention of the telephone was the culmination of work done by many individuals, and led to an array of lawsuits relating to the patent claims of several individuals and numerous companies. The first telephone was invented by Antonio Meucci, but Alexander Graham Bell is credited with the development of the first practical telephone.


Gray is also considered to be the father of the modern music synthesizer, [2] and was granted over 70 patents for his inventions. [3] He was one of the founders of Graybar, purchasing a controlling interest in the company shortly after its inception.

Synthesizer electronic instrument capable of producing a wide range of sounds

A synthesizer or synthesiser is an electronic musical instrument that generates audio signals that may be converted to sound. Synthesizers may imitate traditional musical instruments such as piano, flute, vocals, or natural sounds such as ocean waves; or generate novel electronic timbres. They are often played with a musical keyboard, but they can be controlled via a variety of other devices, including music sequencers, instrument controllers, fingerboards, guitar synthesizers, wind controllers, and electronic drums. Synthesizers without built-in controllers are often called sound modules, and are controlled via USB, MIDI or CV/gate using a controller device, often a MIDI keyboard or other controller.


Graybar is an American employee-owned corporation, based in Clayton, Missouri. It conducts a wholesale distribution business for electrical, communications and data networking products, and is a provider of related supply-chain management and logistics services. It is included on the Fortune 500 list of the largest United States corporations.

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 did not graduate, he taught electricity and science there and built laboratory equipment for its science departments.

Barnesville, Ohio Village in Ohio, United States

Barnesville is a village in Belmont County, Ohio, United States. It is located in the central portion of Warren Township in Belmont County and is part of the Wheeling, West Virginia Metropolitan Statistical Area. The population was 4,193 at the 2010 census.

Oberlin College private liberal arts college in Oberlin, Ohio, United States

Oberlin College is a private liberal arts college in Oberlin, Ohio. Founded as the Oberlin Collegiate Institute in 1833 by John Jay Shipherd and Philo Stewart, it is the oldest coeducational liberal arts college in the United States and the second oldest continuously operating coeducational institute of higher learning in the world. The Oberlin Conservatory of Music is the oldest continuously operating conservatory in the United States. In 1835 Oberlin became one of the first colleges in the United States to admit African Americans, and in 1837 the first to admit women.

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 invention, the first of more than seventy.

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 and organized into a separate company, Graybar Electric Company, Inc. Barton was employed by Western Union to examine and test new products.

The Western Union Company is an American financial services and communications company. Its headquarters is in Meridian, Colorado, although the postal designation of nearby Englewood is used in its mailing address. Up until it discontinued the service in 2006, Western Union was the best-known U.S. company in the business of exchanging telegrams.

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. and remained on the board of directors. The company moved to Chicago near Highland Park. Gray later 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 instead of what appeared to be unpromising competing inventions such as the telephone, White made the decision in 1876 to redirect Gray's interest in the telephone.

Anson Stager Americal Civil War Union Army general and telegraph communications pioneer

Anson Stager was the co-founder of Western Union, the first president of Western Electric Manufacturing Company and a Union Army officer, where he was head of the Military Telegraph Department during the American Civil War.

Highland Park, Illinois City in Illinois, United States

Highland Park is an affluent suburban city in Lake County, Illinois, United States, about 25 miles (40 km) north of downtown Chicago. As of the 2016 population estimate, the population was 29,641. Highland Park is one of several municipalities located on the North Shore of the Chicago metropolitan area.

Acoustic telegraphy was a name for various methods of multiplexing telegraph messages simultaneously over a single telegraph wire by using different audio frequencies or channels for each message. A telegrapher used a conventional Morse key to tap out the message in Morse code. The key pulses were transmitted as pulses of a specific audio frequency. At the receiving end a device tuned to the same frequency resonated to the pulses but not to others on the same wire.

In 1870, Gray developed a needle annunciator for hotels and another for elevators. He also developed a microphone 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, that controlled each tone with 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 Presbyterian Church in Highland Park, Illinois. 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 one of the earliest electric musical instruments using 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. In 1900 Gray worked on an underwater signaling device. After his death in 1901 officials gave the invention to Oberlin College. A few years later he was recognized as the inventor of the underwater signaling device.

On July 27, 1875, Gray was granted U.S. Patent 166,095 for "Electric Telegraph for Transmitting Musical Tones" (acoustic telegraphy).


Because of Samuel White's [4] opposition to Gray working on the telephone, Gray did not tell anybody about his invention for transmitting voice sounds until February 11, 1876 (Friday). 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 a request for examination.

Excerpts from Elisha Gray's patent caveat of February 14 and Alexander Graham Bell's lab notebook entry of March 9, demonstrating their similarity. Bell-gray-smoking-gun.png
Excerpts from Elisha Gray's patent caveat of February 14 and Alexander Graham Bell's lab notebook entry of March 9, demonstrating their similarity.

On Monday morning February 14, 1876, Gray signed and had notarized the caveat that described a telephone that used a liquid transmitter. 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 Gray believed that his caveat arrived a few hours before Bell's application. [5] Bell's lawyers in Washington, DC, had been waiting with Bell's patent application for months, under instructions not to file it in the USA until it had been filed in Britain first. (At the time, Britain would only issue patents on discoveries not previously patented elsewhere.)

According to Evenson, 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. [5] 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 Monday, a few hours after Gray's caveat was delivered 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. [6]

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 suspended Bell's application for 90 days to give Gray time to submit a competing patent application. The suspension also gave Bell time to amend his claims to avoid an interference with an earlier patent application of Gray's that mentioned changing the intensity of the electric current without breaking the circuit, which seemed to the examiner to be an "undulatory current" that Bell was claiming. Such an interference would delay Bell's application until Bell submitted proof, under the first to invent rules, that Bell had invented that feature before Gray. [7]

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 February 29, Bell's lawyer submitted an amendment to Bell's claims that distinguished them from Gray's caveat and Gray's earlier application. [8] [9] On March 3, Wilber approved Bell's application and on March 7, 1876, U.S. Patent 174,465 was published by the U.S. Patent Office.

Bell returned to Boston and resumed work on March 9, drawing a diagram in his lab notebook of a water transmitter being used face down, very similar to that shown in Gray's caveat. [10] Bell and Watson built and tested a liquid transmitter design on March 10 and successfully transmitted clear speech saying "Mr. Watson – come here – I want to see you." Bell's notebooks became public when they were donated to the Library of Congress in 1976. [11]

Although Bell has been accused of stealing the telephone from Gray [12] because his liquid transmitter design resembled Gray's, documents in the Library of Congress indicate that Bell had been using liquid transmitters extensively for three years in his multiple telegraph and other experiments. In April, 1875, ten months before the alleged theft of Gray's design, the U.S. Patent Office granted U.S. Patent 161,739 to Bell for a primitive fax machine, which he called the "autograph telegraph." The patent drawing includes liquid transmitters.

After March 1876, Bell and Watson focused on improving the electromagnetic telephone and never used Gray's liquid transmitter in public demonstrations or commercial use. [13] When Bell demonstrated his telephone at the Centennial Exhibition in June 1876, he used his improved electromagnetic transmitter, not Gray's water transmitter.

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 February 14, 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." [14] 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 an affidavit [15] 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. He 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. Wilbur's affidavit contradicted his earlier testimony, and historians have pointed out that his last affidavit was drafted for him by the attorneys for the Pan-Electric Company which was attempting to steal the Bell patents and was later discovered to have bribed the U.S. Attorney General Augustus Garland and several Congressmen.

Bell's patent was disputed in 1888 by attorney Lysander Hill who accused Wilber of allowing Bell or his lawyer Pollok to add a handwritten margin note of seven sentences to Bell's application that describe an alternate design similar to Gray's liquid microphone design. [16] However, the marginal note was added only to Bell's earlier draft, not to his patent application that shows the seven sentences already present in a paragraph. Bell testified that he added those seven sentences in the margin of an earlier draft of his application "almost at the last moment before sending it off to Washington" to his lawyers. Bell or his lawyer could not have added the seven sentences to the application after it was filed in the Patent Office, because then the application would not have been suspended. [17]

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 chartered 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.[ citation needed ]

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.

Some modern authors [18] [19] incorrectly [20] attribute the Gray code to Elisha Gray, whereas this code was actually named after Frank Gray, who, however, did not invent the code either.

Gray's publications

Gray wrote several books including:

See also

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  1. Shulman 2008.
  2. "What is a Synthesizer and how does it work? |". Playpiano.com. Retrieved 2013-09-02.
  3. "Elisha Gray". Oberlin.edu. Retrieved 2013-09-02.
  4. Dr. Samuel S. White of Philadelphia was a wealthy dentist who paid the legal costs and shared in any profits from Elisha Gray's inventions.
  5. 1 2 Evenson 2000, pp. 68–69.
  6. Shulman 2008, pp. 71.
  7. Evenson 2000, pp. 80–81.
  8. Evenson 2000, pp. 81–82.
  9. Baker 2000, pp. A43–A44.
  10. Shulman 2008, pp. 36-37.
  11. "Alexander Graham Bell family papers". LOC.gov. Library of Congress. Archived from the original on 2013-02-16.
  12. Shulman 2008, p. 211.
  13. Evenson 2000, p. 100.
  14. Baker 2000, pp. 90–91.
  15. Evenson 2000, pp. 167–171.
  16. Evenson 2000, pp. 92, 180.
  17. Evenson 2000, pp. 73–74.
  18. Cattermole, Kenneth W. (1969). Principles of Pulse Code Modulation. New York, USA: American Elsevier. ISBN   0-444-19747-8.
  19. Edwards, Anthony William Fairbank (2004). Cogwheels of the Mind: The Story of Venn Diagrams. Baltimore, Maryland, USA: Johns Hopkins University Press. pp. 48, 50. ISBN   0-8018-7434-3.
  20. Knuth, Donald Ervin (2004-10-15). "Generating all n-tuples". The Art of Computer Programming, Volume 4A: Enumeration and Backtracking. pre-fascicle 2a.


  • Shulman, Seth (2008). The Telephone Gambit . New York, New York: W. W. Norton. ISBN   0-393-06206-6.
  • Evenson, A. Edward (2000). The Telephone Patent Conspiracy of 1876: The Elisha Gray - Alexander Bell Controversy. North Carolina: McFarland. ISBN   0-7864-0883-9.
  • Baker, Burton H. (2000). The Gray Matter: The Forgotten Story of the Telephone. St. Joseph, Mi.: Telepress. ISBN   0-615-11329-X.
  • Coe, Lewis (1995). The Telephone and Its Several Inventors. North Carolina: McFarland Publishers. ISBN   0-7864-0138-9.
  • Patterson, Boyd Crumrine (January 1969). "The Story of Elisha Gray". Western Pennsylvania History. 52 (1): 29–41.
  • Dr. Lloyd W. Taylor, an Oberlin physics department head, 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 patents

Patent images in TIFF format