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![Plate 2 ship4353.jpg Plate 2](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4353.jpg?itok=87Jzgo-N)
Description
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. (Image credit: Oceanographic Museum of Monaco)