Part of Bell harmonic telegraph receiver, patent # 161,739

Description (Brief):

One of two parts of the receiver for Alexander Graham Bell's harmonic telegraph patent, issued April 6, 1875, #161739, see figure 1. Vertically-mounted electro-magnet with a steel armature on walnut base. The armature appears to be a tuned reed with an adjustment mechanism. A knurled knob set opposite the electromagnet adjusts a sliding bar that holds the reed, thereby allowing the user to adjust the reed's response frequency. Electromagnet may be adjusted vertically by loosening the mounting screw and sliding the bracket up or down. Electromagnet is wired to two brass binding posts. Object is on the left in negative number 29308.

Date Made: 1875

Maker: Bell, Alexander Graham

Location: Currently not on view

See more items in: Work and Industry: Electricity


Exhibition Location:

Data Source: National Museum of American History

Id Number: EM.252597.2Catalog Number: 252597.2Accession Number: 49064Patent Number: 161739

Object Name: Receivertelegraph receiverOther Terms: Receiver; Bell harmonic transmitter; Telephones

Measurements: overall: 4 in x 5 in x 3 3/4 in; 10.16 cm x 12.7 cm x 9.525 cm


Record Id: nmah_703242

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