Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1984-03-15
1985-05-21
Little, Willis
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33366, 33327, G01C 906, G01C 908
Patent
active
045177503
ABSTRACT:
A device for sensing angular deviation from the vertical. A housing forming a spherical chamber contains pendulous element comprising a circular plate immersed in a liquid having a low viscosity. The center of the plate is supported for rotational movement about two perpendicular axes of rotation by a pivot at the top of a normally vertical support rod aligned with the vertical axis of the chamber extending upwardly from the bottom of the chamber. The plate provides a couple with the liquid. Electrical pick-offs associated with the two axes of rotation provide an electrical signal proportional to the angular tilt of the circular plate about the two axes relative to the housing.
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