Figure 37. Bucknill-Casella manometric sounder, invented by Lieutenant John T.Bucknill of the Royal Engineers of the Royal Navy in 1870 to mitigate problemswith existing sounding systems. This sounder was based on Bourdon's tube, whose curvature va
4/4/2019 2:12:22 PM
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments