pl23_ship4353.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23ship4353jpgDescription
Plate 2. Magnifying glass devised by Fridtjof Nansen for reading thermometerscales. The thermometer is placed such that the two notches designated c areon the thermometer; the thermometer is adjusted such that the top of the mercury column is located at point d; and the reading glass is focused for readingthe thermometer by turning the interior tube a within tube b.
Credit
Oceanographic Museum of Monaco
Collection
Voyage to Inner Space
History of Oceanography Collection
The Early Instruments - Collections of the Oceanographic Museum at Monaco
Thermometers and Other Temperature Measuring Equipment
Keywords
Oceanography