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![Figure 53 ship4060.jpg Figure 53](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4060.jpg?itok=4Y0Lk8W9)
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Figure 53. A bottom float for studying currents in closed basins of smallextent used by the Copenhagen Hydrographic Laboratory.Left:float. Right: message. This float was first conceived by George P. Bidder with the aid of the Marine Biological Association of Plymouth, U. K., and first used from the HUXLEY in 1904 when 390 were launched in the North Sea. (Image credit: Oceanographic Museum of Monaco | D. Mille)