Electronic level and protractor

Details Electronic level and protractor Electronic level and protractor

1978-06-02

1980-01-08

Phillips, Charles E.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

G01C 906

Patent

active

041820460

ABSTRACT:
An electrically responsive level of the type used for determining inclination with respect to a gravity field is described. The instrument relies for its operation on a bubble-within-a-vial type of inclination sensor. The vial is generally rectangular in cross-section, and its dimensions and the size of the bubble therewithin are selected to assure that the instrument can be used reliably in the field without false readings and the like. The specific leveling instrument described is of the so-called carpenter's type and is usable not only to provide a visual and/or audio indication of a level condition, but also to measure or establish any inclination between the horizontal and vertical.

REFERENCES:
patent: 2511525 (1950-06-01), Bradwell et al.
patent: 2713727 (1955-07-01), Balsam
patent: 3371424 (1968-03-01), Sweet
patent: 3822944 (1974-07-01), Hopkins et al.
patent: 3861052 (1975-01-01), Siegfried

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