This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 Excerpt: ...practical and useful feature, and the one promising the most immediate returns--that of multiple telegraphy. I therefore concluded to secure the articulating feature, and take it up and develop it more completely at another time. About the 15th of January, 1876, I went to Washington, where I spent some time in ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 Excerpt: ...practical and useful feature, and the one promising the most immediate returns--that of multiple telegraphy. I therefore concluded to secure the articulating feature, and take it up and develop it more completely at another time. About the 15th of January, 1876, I went to Washington, where I spent some time in assisting my attorney in the preparation of a number of cases which had been accumulating for several months. This required several weeks of time. While there I put my speaking telephone transmitter into the form of drawings and specifications, and, as my model was not yet ready, I determined to file the specification as a caveat Following out the suggestion made by the diaphragm and string of the lovers' telegraph, I designed a transmitting apparatus which copied the motions of the diaphragm electrically, through the longitudinal vibrations of a light rod attached to the centre of the diaphragm. These electrical vibrations or undulations were the result of the variations in the resistance of the circuit made by the longitudinal motions of the rod, moving in a yielding substance offering a considerable resistance to the passage of the electric current The following is a verbatim copy of the specification, filed in the United States Patent Office, February 14, 1876: Gbay's SPECIFICATION, FILED FEBRUARY 14, 1876. To all whom it may concern: Be it known that I, Elisha Gray, of Chicago, in the County of Cook, and State of Illinois, have invented a new art of transmitting vocal sounds telegraphically, of which the following is a specification: It is the object of my invention to transmit the tones of the human voice through a telegraphic circuit, and reproduce them at the receiving end of the line, so that actual conversations can be carried on by persons ...
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New. Sewn binding. Cloth over boards. 438 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.