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Originally invented by John Leslie in the early 1800's
Weight: 10
Working sight and bubble level
Dimensions: 19
Once the temperature rises
1902 Tyco's 1300A Lloyd's Hygrodeik (Early Model) precision Originally invented by John LeslieA very early, rare, and functional Tyco's Lloyd's Hydrodeik. Dated 1902, this hygrometer uses a wet bulb thermometer (left) and dry bulb thermometer (right), with an adjustable pointer to read relative humidity and dew point temperatures via engraved nickel silver plate. The body is comprised of an olive painted brass. US Made, Manufactured Rochester, NY. In the early days of meteorology, scientists or learned professionals would use these readings,
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