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![Figure 47 ship4421.jpg Figure 47](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4421.jpg?itok=Psn5HwR0)
Description
Figure 47. Sprengel pycnometer, first described by the German chemist HermannSprengel in 1873. He had used this instrument for a number of years. It hadgreat precision and was easy to fill. Later the German chemist Wilhelm Ostwaldpartially modified it, replacing the original U tube with a single-sided one. (Image credit: Oceanographic Museum of Monaco | Y. Berard)