Types of hygrometers, 18th century

Types of hygrometers, 18th century, to measure moisture content. Jean-Andre De Luc's whalebone hygrometer, and others by Horace-Benedict de Saussure, Benjamin Meggot Forster, Henry Kater and the Hungarian Machine. Copperplate engraving by Sidney Hall from Abraham Rees Cyclopedia or Universal Dictionary of Arts, Sciences and Literature, Longman, Hurst, Rees, Orme and Brown, London, 1820

Cyclopedia Dictionary Forster Hydraulics Hygrometer Measure Moisture Rees Saussure Whalebone

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