Hamilton telegraph repeater patent model


Telegraph repeaters amplified electrical signals in a telegraph line. Telegraph messages traveled as a series of electrical pulses through a wire from a transmitter to a receiver. Short pulses made a dot, slightly longer pulses a dash. The pulses faded in strength as they traveled through the wire, limiting the distance a message could travel. Repeaters remedied that problem by detecting a weak signal and using a local power source to re-energize and re-transmit the signal down the line.

This model was submitted to the U.S. Patent Office by inventor William Hamilton of Albany, New York, along with his patent application. On 12 September 1865, he received patent #49875 for his "Improvement in Telegraphic Repeaters." Hamilton's idea was to improve automatic repeaters that could switch between lines without the aid of an operator. He modified the two sounders by lengthening the lever arms so they could activate a new switch and circuit design. The cylinders represent batteries that may be of the Grove type. Hamilton used real relays and sounders made by A. S. Chubbuck of Utica, NY, on his model.

Date Made: 1865

Maker: Chubbuck, Arinaldo S.Hamilton, William H.

Location: Currently not on view

See more items in: Work and Industry: Electricity, Communications, Telegraph Relays & Repeaters


Exhibition Location:

Data Source: National Museum of American History

Id Number: EM.251261Catalog Number: 251261Accession Number: 48865Patent Number: 49875

Object Name: repeatertelegraph relaytelegraph repeaterObject Type: Patent ModelOther Terms: telegraph relay; Telegraph; Receiver

Physical Description: wood (overall material)brass (overall material)copper (overall material)paper (overall material)cloth (overall material)plastic (overall material)steel (overall material)silver (overall material)Measurements: overall: 3 1/2 in x 11 7/8 in x 7 3/4 in; 8.89 cm x 30.1625 cm x 19.685 cm

Guid: http://n2t.net/ark:/65665/ng49ca746ab-5f00-704b-e053-15f76fa0b4fa

Record Id: nmah_703232

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