Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1981-06-22
1984-06-05
Little, Willis
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33346, 33391, G01C 908
Patent
active
044519915
ABSTRACT:
A vertical indicating device is comprised of a compound pendulum immersed in a liquid and one or more paddles attached to the pendulum to couple its motion to the liquid. The effective length of the equivalent pendulum is much longer than the physical dimension of the device. The loading on the bearing is minimal, thus, achieving low friction and high accuracy.
REFERENCES:
patent: 689323 (1901-12-01), Quimby
patent: 2924022 (1960-02-01), Callahan
patent: 3520065 (1970-07-01), Pace
patent: 3945128 (1976-03-01), Weiss
patent: 3975831 (1976-08-01), Jysky et al.
patent: 4096638 (1978-01-01), Schimming
patent: 4163325 (1979-08-01), Hughes
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