plummet lamp
Date: circa 1900
Inventory Number: 5115b
Classification: Lamp
Maker: English ?
Maker: American ?
User: Department of Geology and Geography, Harvard University (1890 - 1961)
Cultural Region:
City of Use:
Dimensions:
without chain: 14.2 × 6.8 × 6.7 cm (5 9/16 × 2 11/16 × 2 5/8 in.)
Material:
Description:
Conical brass plumb bob with steel tip, mounted on a black gimbal, to which are attached two brass chains. The chains are joined at the opposite end by a hanger-like hook. The knurled knob on top of the plumb bob may be screwed off to expose a gas lamp.
Signedunsigned
FunctionUsed to determine a vertical line in underground surveying.
Curatorial RemarksIdentical to 5115a.
ProvenanceFrom the Mineralogical Division of the Geology Department, Harvard, 1966.