Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1977-03-31
1979-05-08
Phillips, Charles E.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 906
Patent
active
041528395
ABSTRACT:
A pair of sealed capsules are provided in a housing. Each of the capsules has a first electrode extending therein on one side thereof from end to end. A pair of electrodes are positioned in each capsule at corresponding ones of the ends opposite the first electrode. A center electrode is positioned in each of the capsules at the center thereof opposite the first electrode. A bead of mercury is provided in each of the capsules. One of the capsules is positioned so that when the housing is horizontal the mercury therein contacts the first and center electrodes thereof and the other of the capsules is positioned so that when the housing is vertical the mercury therein contacts the first and one of the end electrodes thereof. A pair of center lamps and two pairs of end lamps are provided for the capsules and connected to the corresponding electrodes of each. The lamps are of different colors so that when the housing is positioned horizontally the center lamp of the first capsule is illuminated and when the housing is vertical the center lamp of the second capsule is illuminated. When the end lamps of the capsules are illuminated, the user knows that the housing is neither horizontal nor vertical.
REFERENCES:
patent: 2511525 (1950-06-01), Bradwell et al.
patent: 3299523 (1967-01-01), Lea
patent: 3823846 (1974-07-01), Bhat et al.
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