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SHORTS GAS INDICATOR, 1900's
Used for measuring the coal gas content in air by atmospheric pressure, and indicated by the percentage of coal gas.
The mechanics of the instrument are identical to that of a normal Barometer.
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- I have one of these devices, I was wondering if anyone knows what the removable knob to the right is for? the back is also removable.
.......... Scott Humphries, Newport Pagnell, 3rd of February 2012
- This is an early form of 'explosimeter' to indicate the hazard arising from a gas leak, particularly in a street excavation or in the basement or a room of a building. Normally, of course, gas would not be present in such locations.
.......... John Webb, London Colney, 18th of March 2010