Figure 65. Marconi electrolytic sounder - a Langevin-Touly electric recordingsounder marketed by the Marconi Sounding Device Co. Ltd. which sold theseinstruments in Great Britain. The Langevin-Touly instrument was first marketedin 1935.
4/4/2019 2:12:26 PM
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments