Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-10-22
1978-08-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
33366, G01D 534
Patent
active
041106091
ABSTRACT:
A tilt limit detecting apparatus which includes an elongated vial containing an opaque liquid with a bubble therein and light source-photo transistor pairs at each end aligned to intersect the bubble when the vial is tilted and in which the vial has a cross section which results in the optical axes between the light sources and photo transistors intersecting the vial at an angle which at least approaches 90.degree..
REFERENCES:
patent: 3204233 (1965-08-01), Olliff
patent: 3324564 (1967-06-01), Wright
patent: 3813556 (1974-05-01), Beer et al.
patent: 3863067 (1975-01-01), Gooley
Kennedy Thomas W.
Nelms David C.
The Singer Company
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