Lighted plumb bob

Details Lighted plumb bob Lighted plumb bob

1985-04-26

1986-12-02

Haroian, Harry N.

Geometrical instruments

Indicator of direction of force traversing natural media

With viewing aid

33392, G01C 1510

Patent

active

046254285

ABSTRACT:
An improved plumb bob having a downwardly directed light beam to indicate the point directly below the plumb bob. The light is operated by batteries within the plumb bob and, in order to prevent undesired draining of the batteries, the light is switched on and off by the weight of the plumb bob acting on the line. The switch is activated by a conductive spring held within the plumb bob.

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