Teltru psychrometers
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Small JPG1200 x 1433px — 364 KBLarge JPG2880 x 3438px — 1.7 MBFull-sized JPG5269 x 6289px — 4.9 MBOriginal fileTIFF — 5269 x 6289px — 94.9 MBThe second side of the poster has been cropped into three parts for ease of reading. These particular instruments were manufactured by the E. Vernon Hill Company based in Chicago.
Psychrometers, also known as wet-and-dry-bulb thermometers, are a type of hygrometer. They measure humidity by comparing the temperatures of two thermometers, one wet and one dry.
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Cite as
E. Vernon Hill Company. “Teltru Psychrometers,” n.d. Beckman Historical Collection, Box 19, Folder 38. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/6395w716v.
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