Psychrometer, H. Geissler, 1846 Humidity meter of the psychrometer type, with two thermometers in a standard, incomplete. The scale of both thermometers goes from -12 ° to +44 ° Celsius. One thermometer has a sock around the mercury ball, which is made moist. From the temperature difference between the two thermometers caused by the evaporation of the moisture, the humidity of the air can be read. The foot of De Standaard is weighted with lead. instrument maker: The Hagueafter design by: Berlin wood (plant material). brass (alloy). lead (metal). glass. mercury. wax. textile materials

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