Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1995-08-07
1997-04-22
Fulton, Christopher W.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33666, G01C 1510
Patent
active
056219776
ABSTRACT:
There is disclosed a plumb bob having a segmented bob body with an upper bob body segment which is attached to a flexible suspension cord and a removably attached lower bob body segment. The upper segment of the bob body has a marker mechanism which can be an internally contained marker that is resiliently biased within the upper segment by springs which permit the marker to project from the under surface of the body upon impact, registering a point on the lower surface. An alternative marker mechanism comprises a pair of crossed slots in the lower end surface of the upper segment which guide a marker for scribing lines which intersect at the transfer point. The upper segment of the bob body is secured on the transfer point by a central protuberance which permits the body to tilt, but not topple, resting at the transfer point. A third embodiment which is useful in either of the first two embodiments comprises a removable stand attached to the plumb bob body which has a lower support member located on a plane through which the lower point of the plumb bob slightly projects, whereby the plumb bob can be rested on the transfer point in a slightly tilted orientation.
REFERENCES:
patent: 995872 (1911-06-01), Joice
patent: 1025828 (1912-05-01), Paul
patent: 1110146 (1914-09-01), Rice
patent: 2592425 (1952-04-01), Jackson
patent: 2795053 (1957-06-01), Wohlstrom
patent: 3113387 (1963-12-01), Bean, Jr.
patent: 5157843 (1992-10-01), Barcewski
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