The telautograph transmitted electrical impulses recorded by potentiometers at the sending station to servomechanisms attached to a pen at the receiving station, reproducing a drawing or signature made by the sender at the receiving station. It was the first device to transmit drawings to a stationary sheet of paper; previous inventions in Europe had used rotating drums to record these transmissions.
In an interview in The Manufacturer & Builder (Vol. 24: No. 4 (1888) 5–86) Gray made this statement:
"By my invention you can sit down in your office in Chicago, take a pencil in your hand, write a message to me, and as your pencil moves, a pencil here in my laboratory moves simultaneously, and forms the same letters and words in the same way. What you write in Chicago is instantly reproduced here in fac-simile. You may write in any language, use a code or cipher, no matter, a fac-simile is produced here. If you want to draw a picture it is the same, the picture is reproduced here. The artist of your newspaper can, by this device, telegraph his pictures of a railway wreck or other occurrences just as a reporter telegraphs his description in words. The telautograph became very popular for the transmission of signatures over a distance, and in banks and large hospitals to ensure that doctors' orders and patient information were transmitted quickly and accurately" (quoted in Wikipedia article on Telautograph, accessed 03-02-2011).
Gray's patents on the telautograph are:
Gray, Elisha. "Art of Telegraphy", United States Patent 386,814, July 31, 1888.
Gray, Elisha. "Telautograph", United States Patent 386,815, July 31, 1888.
Gray, Elisha. "Telautograph", United States Patent 461,470, October 20, 1891.
Gray, Elisha. "Art of and Apparatus for Telautographic Communication", United States Patent 461,472, October 20, 1891.
Gray, Elisha. "Telautograph", United States Patent 491,347, February 7, 1893.
Gray, Elisha. "Telautograph", United States Patent 494,562, April 4, 1893.
Jean Renard Ward, History of Pen and Gesture Computing http://rwservices.no-ip.info:81/pens/biblio70.html#Gray1888b, accessed 03-02-2011