Pistonphone type 4220 serial no.221377 by Bruel & Kjaer
- Made:
- 1960-1979 in Copenhagen
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Science Museum Group
© The Board of Trustees of the Science Museum
Pistonphone type 4220 serial no.221377 by Bruel & Kjaer, Copenhagen, for calibration of precision sound measuring systems, in fitted wooden case (lacks accessories)
Details
- Category:
- Acoustics
- Object Number:
- 1992-850
- type:
- pistonphone
- credit:
- Civil Aviation Authority. Chief Scientis
