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.
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.
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.
Famous quotes containing the words wheat and/or lamp:
“[Tobacco] is a culture productive of infinite wretchedness.... The cultivation of wheat is the reverse in every circumstance.”
—Thomas Jefferson (1743–1826)
“But see, the Virgin blest
Hath laid her Babe to rest:
Time is our tedious song should here have ending;
Heaven’s youngest teemed star,
Hath fixed her polished car,
Her sleeping Lord with handmaid lamp attending;
And all about the courtly stable,
Bright-harnessed angels sit in order serviceable.”
—John Milton (1608–1674)