1902 Tyco's 1300A Lloyd's Hygrodeik (Early Model) precision The device works using a

The device works using a fixed horizontal brass rod and a vertical rod holding a gold leaf

Dimensions: 19

Weight: 13

Originally invented by John Leslie in the early 1800's

1902 Tyco's 1300A Lloyd's Hygrodeik (Early Model) precision The device works using aA 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,