Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1985-08-12
1987-08-11
Stearns, Richard R.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33381, G01C 928
Patent
active
046852190
ABSTRACT:
A spirit level which includes an elongated frame with one or more vial receiving openings therein. A liquid-containing spirit level vial extends at least partially across each of the openings. A transparent sight plate is removably extended at least partially across each of the openings. Structure is provided for limiting the movement of the respective sight plate in the respective opening toward the spirit level vial located therein, and a gasket is positioned in the opening over the sight plate to retain the sight plate against movement away from the spirit level vial. The gasket is removably retained in its described position, and can be removed to permit the sight glass to be extricated to permit access to be easily had to the respective spirit level vial.
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Haefner LeRoy H.
Rhodes Stephen M.
Laney William R.
Macklanburg-Duncan Company
Stearns Richard R.
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