| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Electric cap lamp | Mining | This lamp consists of a flat portable battery that is strapped around the miner's waist and is connected by an insulated cord to a small electric light and reflector that is fastened on the front of the miner's cap. See also: safety lamp. (references) | |
| Miner's electric cap lamp | Mining | A. A lamp for mounting on a miner's cap and receiving electric energy through a cord which connects the lamp with a small battery.b. An electric lamp designed for fixing to a miner's helmet. Its principal parts are: (1) the battery, either lead acid or alkaline; (2) the headpiece, of plastic or aluminum alloy, with switch; and (3) a length of twin-cord cable covered with tough rubber or with neoprene--a fire- and acid-resisting substitute. The lead-acid lamps commonly use either a 4-V, 1.0-A bulb with a light output of about 47.5 lumens or else a 4-V, 0.8-A bulb of 38 lumens output. The headpiece is equipped with an auxiliary, 4V, 0.46-A bulb. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
