Morkrum teletype transmitter and receiver
date: label: date made
content: 1921
label: associated date
content: 1930
name: label: maker
content: Morkrum Teletype Co.
notes: label: Description (Brief)
content: Paper reel mounted underneath unit. The unit has a Qwerty keyboard. This unit was developed by the Morkrum Company, and applied for wireless transmission from aircraft to ground. The aircraft teletype derived electric power from a 6 volt storage battery. The base of this device supports a selective printing mechanism operated by a motor and controlled by a pair of armature coils actuated by incoming radio signals. These coils are contained in the type B relay (Cat no 321927) which in turn is connected to an audio amplifier. On transmit the keying mechanism sends pulsed code signals which vary for each letter and thereby stop and start RF oscillations in the antenna according to a pre-arranged sequence. The transmitting electronic circuit is a three tube triode type oscillator. This unit was demonstrated at the Navy Radio Laboratory, Bureau of Standards, in November 1921. Reference: 4th Circuit Court of Appeals Transcript - Vol 2, pp. 275-281. (Article extracted from Radio News.) In the U.S. Patent Office: Record and Testimony on Behalf of Lowell and Dunmore (1928), page 466, 471.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from John B. Brady
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.321928
label: catalog number
content: 321928
label: accession number
content: 245709
objectType: label: Object Name
content: Transmitter and Receiver, Teletype
label: Object Name
content: teletype unit
label: Object Name
content: teletype transceiver
label: Other Terms
content: Transmitter and Receiver, Teletype; Telegraphy
physicalDescription: label: Measurements
content: overall: 9 in x 12 1/2 in x 13 3/4 in; 22.86 cm x 31.75 cm x 34.925 cm