150.00 $ Anemometer, Davis Instrument Co. Freeman
- Location: Freeman, Missouri, United States
Anemometer, Davis Instrument Co.
The following in an excerpt from www.halslamppost.com.
The anemometer is an instrument designed to measure the flow or speed of air and was used in the ventilation of mine shafts. As shown, a vaned propeller is attached to a dial that records the number of turns that it makes over a period of time and converts this reading into a measurement of air speed. In deep coal mines, the gases given off by the coal can accumulate in the mine passages and become concentrated. When this happens, the slightest spark can set off an explosion. To prevent this happening, big fans are used at the pit top to draw fresh air around the mine and take the gas away to the surface. Anemometers were used by the Mine Deputies every day to check that there was a sufficient flow of fresh air throughout the whole mine.
There is a similar Davis anemometer sold recently on Ebay for $299
Call Brian @ 4four3.2five0.2five22. Please leave a message if I dont answer. I will call back.
I deal in person and in cash. NO TEXTS. I will not respond.
Phone number ✆ +1 636-419-6346
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