Telegraph Sounder Magnets
date: label: date made
content: 1865
name: label: maker
content: Clark, James J.
label: maker
content: Splitdorf, Henry
notes: label: Description (Brief)
content: Telegraph sounders convert electrical pulses into audible sounds and are used to receive Morse code messages. The message travels as a series of electrical pulses through a wire. Short pulses make a dot, slightly longer pulses make a dash. The sequence of dots and dashes represent letters and numbers. The pulses energize the sounder’s electromagnets which move a lever-arm. The arm makes a loud “click” when it strikes a crossbar and the operator translates the pattern of sounds into the original language. This is a patent model for an early form of sound amplifier. The patent covers the addition of a rod attached to the anvil on the electromagnet and connected to the ends of the wooden box. When the lever strikes the anvil, the vibration is also transmitted through the rod to the box boosting the sound.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
label: See more items in
content: Communications
label: See more items in
content: Telegraph Sounders
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.308900
label: catalog number
content: 308900
label: accession number
content: 89797
label: patent number
content: 49857
objectType: label: Object Name
content: telegraph receiver
label: Object Name
content: telegraph sounder
label: Object Type
content: Patent Model
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: metal (overall material)
label: Physical Description
content: cloth (overall material)
label: Measurements
content: overall: 4 1/4 in x 9 3/4 in x 5 1/2 in; 10.795 cm x 24.765 cm x 13.97 cm