Lighted plumb bob

Details Lighted plumb bob Lighted plumb bob

1985-08-12

1986-07-01

Frankfort, Charles

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33348, G01C 1510

Patent

active

045971862

ABSTRACT:
A plumb bob having a built-in light source and electrical power supply including a main barrel, a conical tip and a screw cap. Tightening of the screw cap closes the circuit for operation of the light source. A suspension line extends from the cap and is stored when not in use between the cap and barrel where it serves to prevent tightening of the cap and light source actuation.

REFERENCES:
patent: 880387 (1908-02-01), Morrill
patent: 1026669 (1912-05-01), Garner
patent: 2583491 (1952-01-01), Orlando
patent: 2665498 (1954-01-01), Mitchell

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