Part of Bell harmonic telegraph receiver, patent # 161,739
date: label: date made
content: 1875
name: label: maker
content: Bell, Alexander Graham
notes: label: Description (Brief)
content: 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.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.252597.2
label: catalog number
content: 252597.2
label: accession number
content: 49064
label: patent number
content: 161739
objectType: label: Object Name
content: Receiver
label: Object Name
content: telegraph receiver
label: Other Terms
content: Receiver; Bell harmonic transmitter; Telephones
physicalDescription: label: Measurements
content: overall: 4 in x 5 in x 3 3/4 in; 10.16 cm x 12.7 cm x 9.525 cm