Figure 69

Figure 69. Langevin quartz ultrasonic projector. This device was built in 1925 by the Society for Condensation and Mechanical Applications based on work by Paul Langevin. It was also distributed by the Marconi Company. It consisted of a piezo-electric emitter. No informatin exists concerning tests and use of this instrument.

Photo Category: Oceanography - Historical instruments

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Author: Y. Berard/Oceanographic Museum of Monaco/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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Added On	18th October 2015
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