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 joker to the mercury bulb, which is 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 the standard is weighted with lead.

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Size: 1570px × 2500px
Photo credit: © BTEU/RKM / Alamy / Afripics
License: Licensed
Model Released: No

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