Figure 25. Bachmann penetration tubes. These instruments are not properlysounders, but an accessory for use with the instruments of the time. Thebacteriologist Martin Bachman designed these tubes in order to elongate the real sounder tube and penet
4/4/2019 2:12:20 PM
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments