Precise-reading angular level

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive

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G01C 910

Patent

active

046567526

ABSTRACT:
A precise-reading angular level includes a casing, a rotational protractor rotatably mounted in the casing, a plumbing swing wheel pivotedly mounted in the protractor, and a vernier formed on the central top position of the casing above the protractor, wherein the protractor is made to have an outer angle scale matching with the vernier scale and an inner angle scale operatively coinciding with a pointer printed on the swing wheel to prevent strabismal reading error, and an aligning pointer is formed on the protractor to projectively superimpose the pointer on the wheel for convenient reading of the measured angle even after removing the level from the measuring position.

REFERENCES:
patent: 841598 (1907-01-01), Stricker
patent: 2298072 (1942-10-01), Somerville et al.
patent: 3344531 (1967-10-01), Emerson

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