Figure 42. Hopfgartner and Arzberger sounder, devised by Lieutenant Franz vonHopfgartner of the Austrian Merchant Marine and Moriz Arzberger, a civil engineer, this apparatus used the same principle as aneroid barometers which utilizedthe pressure d
4/4/2019 2:12:22 PM
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments