Level based on moire effect with ambient light

Details Level based on moire effect with ambient light Level based on moire effect with ambient light

1984-12-27

1986-05-27

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33396, G01C 920

Patent

active

045906815

ABSTRACT:
A level comprises a sealed casing which holds a liquid and has a flat bottom end. It also includes a light admissive top section, bearing a periodic grating of alternating transparent and opaque stripes. A float is in the liquid inside a compartment of the casing underneath the light admissive top section. The float is capable of changing its position inside the chamber so as to retain its position relative to the horizon when the chamber is filled, and a mirror on the top face of said float.

REFERENCES:
patent: 2525387 (1950-10-01), Volk
patent: 2587878 (1952-03-01), Nachtrieb
patent: 2767483 (1956-10-01), Sauer, Jr.
patent: 3023512 (1962-03-01), Morris et al.
patent: 3711178 (1973-01-01), Humphrey
patent: 3842512 (1974-10-01), Stoltz et al.

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