Digital Library Search
![Figure 37 ship4494.jpg Figure 37](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4494.jpg?itok=vgxf3jP0)
Description
Figure 37. Assman aspirating psychrometer, used to determine relative humidityby comparing dry and humid air temperatures. The instrument was designed onprinciples discovered by the German Ernst Ferdinand August, the director of theGymnasium of Berlin, in 1825. Professor Richard Assman of the MeteorologicalInstitute of Berlin, built this instrument about 1886. (Image credit: Oceanographic Museum of Monaco | Y. Berard)