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Figure 71. A Mohr-Westphal density balance. This instrument was first described in 1832 by the German chemist Carl Friedrich Mohr. It is a balance with twoarms, where the equilibrium is reached by adding weight on a tray. This type of instrument was modified by G. Westphal who replaced the tray with an adjustable counterweight. Julien Thoulet used this type of instrument in his studies. (Image credit: Oceanographic Museum of Monaco | Y. Berard)