Oilwick Lamps/Plummet Lamp

Oilwick Lamps

Plummet Lamp.jpg - PLUMMET LAMP - Brass plummet/plumb bob oil lamp, body 6 1/2 in. long with 3 in. dia.gimbal, 36 in. chains with swivel and hook, with wick and wick cap,no marking (Of the varied forms of plumb bobs, one of the most unusual designs, the plummet lamp, was adapted for use in underground mining and tunnel surveys. The purpose of the plummet lamp was to provide an illuminated target for the surveyor/engineer conducting his work underground. Unlike above-ground surveying, backsight and forsight stations in underground surveys were placed in the ceiling (as constant work would obliterate points in the floor). In use, the plummet lamp was suspended from a station spad in the ceiling and the wick (fed from a fuel font within the hollowed body of the plummet) was ignited. The instrument man then had an easily sightable illuminated point. The conventional plummet-lamp as shown here incorporated a heavy inverted brass cone with an internal fuel font and exposed wick, suspended in a gimbaled ring, the latter held at two points of attachment by a suspension chain. The lamp wick and flame were exposed to possible wind currents and dripping ceilings making its operation not too efficient in some mine surveying applications.)

Plummet Lamp | PLUMMET LAMP - Brass plummet/plumb bob oil lamp, body 6 1/2 in. long with 3 in. dia. gimbal, 36 in. chains with swivel and hook, with wick and wick cap, no marking (Of the varied forms of plumb bobs, one of the most unusual designs, the plummet lamp, was adapted for use in underground mining and tunnel surveys. The purpose of the plummet lamp was to provide an illuminated target for the surveyor/engineer conducting his work underground. Unlike above-ground surveying, backsight and forsight stations in underground surveys were placed in the ceiling (as constant work would obliterate points in the floor). In use, the plummet lamp was suspended from a station spad in the ceiling and the wick (fed from a fuel font within the hollowed body of the plummet) was ignited. The instrument man then had an easily sightable illuminated point. The conventional plummet-lamp as shown here incorporated a heavy inverted brass cone with an internal fuel font and exposed wick, suspended in a gimbaled ring, the latter held at two points of attachment by a suspension chain. The lamp wick and flame were exposed to possible wind currents and dripping ceilings making its operation not too efficient in some mine surveying applications.)

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