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![Figure 70 ship4447.jpg Figure 70](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4447.jpg?itok=YFZJT9Is)
Description
Figure 70. Thoulet device for measuring the density of minerals by means of aniodine solution. The method used in image ship4445 was very crude but thisdevice gave a real measurement, which although a long and delicate process,could be very precise. (Image credit: Oceanographic Museum of Monaco | Y. Berard)