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NOAA Photo Library Image - ship4239

Figure 37. Bucknill-Casella manometric sounder, invented by Lieutenant John T. Bucknill of the Royal Engineers of the Royal Navy in 1870 to mitigate problems with existing sounding systems. This sounder was based on Bourdon's tube, whose curvature varied as a function of the pressure difference between the interior and the fluid in which it was immersed. Louis P. Casella made the final product.

Image ID: ship4239, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco

Category: Oceanography/Historical instruments/

High Resolution Photo Available

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Last Updated:
November 10, 2017