Types of hygrometers, 18th century, to measure

Types of hygrometers, 18th century, to measure moisture content by Anderson 8, Dr. Robert Hooke 9, 10, Dr. Hale 11, James Ferguson 12, 13, and Bradford's hydrostatical instrument for weighing coin and checking weight and purity 1-3. Copperplate engraving by Wilson Lowry from Abraham Rees Cyclopedia or Universal Dictionary of Arts, Sciences and Literature, Longman, Hurst, Rees, Orme and Brown, London, 1819

Coin Cyclopedia Dictionary Hale Hooke Hygrometer Measure Moisture Purity Rees

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