Figure 25

Figure 25. Bachmann penetration tubes. These instruments are not properly sounders, but an accessory for use with the instruments of the time. The bacteriologist Martin Bachman designed these tubes in order to elongate the real sounder tube and penetrate more deeply into the sediment. These tubes achieved deep penetration but little sample material. First used on VALDIVIA in 1898.

Photo Category: Oceanography - Historical instruments