Figure 36. Ericsson pneumatic sounder, invented in 1835 by John Ericsson of USS MONITOR fame. This was among the first instruments to use the principle ofpressure needed to compress air a given amount to derive the depth of water.
4/4/2019 2:12:22 PM
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments