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![Figure 59 ship4187.jpg Figure 59](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4187.jpg?itok=I0M_gdlD)
Description
Figure 59. Insulated Knudsen bottle with frame. Martin Knudsen designed thisapparatus about 1921 with the aid of Hans J. Nielsen. This bottle had a largeaperture which facilitated the circulation of the water into the bottle. Notethe messenger on the ascending mode image. Left: descending. Right:ascending. (Image credit: Oceanographic Museum of Monaco | Y. Berard)