Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1996-05-06
1998-01-06
Will, Thomas B.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
2423811, 33413, G01C 1510
Patent
active
057041318
ABSTRACT:
A plumb bob apparatus for locating verticals with a line capable of automatic braking and retraction comprising a substantially square hollow housing wherein a spring loaded spool, in combination with an adjustable tension and braking device, allow a plumb bob weight to be manually extended by a string or flexible member to any length where the plumb bob weight will remain until retraction is effected. The preferred embodiment of the plumb bob apparatus also possesses a pin-tipped plunger, a notch, and a magnetic strip for attachment of the apparatus to a variety of upper reference points to which the standard plumb bob apparatus would not otherwise be capable of attachment and use.
REFERENCES:
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