Figure 1 The Mohr-Westphal balance
Karl Friedrich Mohr (1806–79) was at one time the leading analytical chemist in Germany. He was an incredibly inventive man who developed all manner of apparatus (such as the cork-borer) and who improved and refined many quantitative chemical processes with techniques that straddle physics and chemistry.
One of his inventions was the Mohr balance (also known nowadays as the Westphal balance), which is shown in Figure 1.
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