Wheat lamp

A wheat lamp is a type of incandescent light designed for use in underground mining, named for inventor Grant Wheat and manufactured by Koehler Lighting Products in Wilkes-Barre, Pennsylvania, United States, a region known for extensive mining activity.[1] [2]

A safety lamp designed for use in potentially hazardous atmospheres such as firedamp and coal dust, the lamp is mounted on the front of the miner's helmet and powered by a wet cell battery worn on the miner's belt. The average wheat lamp uses a 3-5 watt bulb which will typically operate for 5 to 16 hours depending on the amp-hour capacity of the battery and the current draw of the bulb being used. [3]

A grain of wheat lamp is an unrelated, very small incandescent lamp used in medical and optical instruments, as well as for illuminating miniature railroad and similar models.

References
  1. City of Marlborough, retrieved July 7, 2011.
  2. Erin Ann Thomas, Coal in Our Veins: A Personal Journey, University Press of Colorado, 2013, ISBN 1457184435,Chapter 23, first page
  3. L.C. Isley, A. B. Hooker, Permissible Electric Mine Lamps, US Department of Commerce Bulletin No. 332, 1930, pages 32-34


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