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The inscriptions on this chronometer read "General Radio Company" and "Synchro-Clock Type 611-A." The 1935 General Radio Co. catalog described this as a "Standard Frequency Assembly, the synchronous-motor-driven clock is the counting device for totalizing the number of vibrations of the crystal in any given time interval." In other words, with the crystal as a stable oscillator this device could be used as a source of time intervals, such as generating timed electrical pulses. Conversely, by comparing it with standard time the same oscillator could be used as a measure of frequency.
Currently not on view
Object Name
chronometer, "synchro-clock"
General Radio Company
overall: 19 cm x 27.5 cm x 25 cm; 7 15/32 in x 10 13/16 in x 9 27/32 in
overall: 7 3/8 in x 10 3/4 in x 10 in; 18.7325 cm x 27.305 cm x 25.4 cm
ID Number
catalog number
accession number
Credit Line
Columbia University
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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