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![Figure 43 ship4500.jpg Figure 43](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4500.jpg?itok=qSfQx4j8)
Description
Figure 43. Buchanan hypsometer - this instrument is meant to determine altitude by relating the temperature of the boiling point of water to altitude. Asaltitude increases, the boiling point decreases. The instrument shown uses amethod developed by Regnault and was used by John Young Buchanan in 1899. (Image credit: Oceanographic Museum of Monaco | Y. Berard)