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. A wooden base with a wooden block standing on top carrying a portion of the apparatus consisting of two brackets for carrying a pivoted lever and 2 mercury cups for making contact. Each cup is connected to a brass binding post. Lever arm is missing; Bell wrote that it was made of "wood, straw, or other suitable material," and so may not have survived. Unit is actuated by the tuned reed receiver (catalog #252597.2).
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.252597.1
label: catalog number
content: 252597.1
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: Transmitter; Telegraphy
physicalDescription: label: Measurements
content: overall: 4 1/2 in x 4 1/4 in x 3 1/2 in; 11.43 cm x 10.795 cm x 8.89 cm