A Reading of the Patent of Alexander Graham Bell US174,465: 150th Anniversary

#150thAnniversaryAlexanderGrahamBellPatent #80thAnniversaryComputerSociety #Patent #CareersinTech #CareersinTechnology

UNITED STATES PATENT OFFICE.

--------------

ALEXANDER GRAHAM BELL, OF SALEM, MASSACHUSETTS.

--------------

IMPROVEMENT IN TELEGRAPHY.

--------------

Specification forming part of Letters Patent No. 174,465, dated March 7, 1876; application filed February 14, 1876.

To all whom it may concern:

(1) Be it known that I, ALEXANDER GRAHAM BELL , of Salem, Massachusetts, have invented certain new and useful Improvements in Telegraphy, of which the following is a specification:--

To be continued...

Text of the Patent, Continued: 

In Letters Patent granted to me April 6, 1875, No. 161,739, I have described a method of, and apparatus for, transmitting two or more telegraphic signals simultaneously along a single wire by the employment of transmitting instruments, each of which occasions a succession of electrical impulses differing in rate from the others; and of receiving instruments, each tuned to a pitch at which it will be put in vibration to produce its fundamental note by one only of the transmitting instruments; and of vibratory circuit-breakers operating to convert the vibratory movement of the receiving instrument into a permanent make or break (as the case may be) of a local circuit, in which is placed a Morse sounder, register, or other telegraphic apparatus. I have also therein described a form of autograph-telegraph based upon the action of the above-mentioned instruments.

The remainder of this patent and its Figures will be presented at the Event concluding with:

Having described my invention, what I claim, and desire to secure by Letters Patent, is as follows:

1. A system of telegraphy in which the receiver is set in vibration (8) by the employment of undulatory currents of electricity, substantially as set forth.
2. The combination, substantially as set forth, of a permanent magnet or other body capable of inductive action, with a closed circuit, so that the vibration of the one shall occasion electrical undulations in the other, or in itself, and this I claim, whether the permanent magnet be set in vibration in the neighborhood of the conducting-wire forming the circuit, or whether the conducting-wire be set in vibration in the neighborhood of the permanent magnet, or whether the conducting wire and the permanent magnet both simultaneously be set in vibration in each other's neighborhood.
3. The method of producing undulations in a continuous voltaic current by the vibration of motion of bodies capable of inductive action, or by the vibration or motion of the conducting-wire itself, in the neighborhood of such bodies, as set forth.
4. The method of producing undulations in a continuous voltaic circuit by gradually increasing and diminishing the resistance of the circuit, or by gradually increasing and diminishing the power of the battery, as set forth.
5. The method of, and apparatus for, transmitting vocal or other sounds telegraphically, as herein described, by causing electrical undulations, similar in form to the vibrations of the air accompanying the said vocal or other sounds, substantially as set forth.

In testimony whereof I have hereunto signed my name this 20th day of January, A.D. 1876.

                                ALEX. GRAHAM BELL.

Witnesses :

       Thomas E. Barry.

       P. D. Richards.