Polyfunctional spirit-level

Details Polyfunctional spirit-level Polyfunctional spirit-level

1986-02-28

1987-03-31

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

G01C 920

Patent

active

046531939

ABSTRACT:
A polyfunctional spirit-level comprising a four-sided, elongated spirit-level body containing a bubble tube, axially disposed therein and adapted to be viewed from above when using three of the sides, two sides adapted for use as a level and two side adapted for use as a declination indicator for different slopes of sewer lines, said level small enough to be slipped in one's pocket and carried on one's person.

REFERENCES:
patent: 35298 (1862-05-01), Cahoon
patent: 2014420 (1935-09-01), Zieman
patent: 2520700 (1950-08-01), Thorndike
patent: 4419833 (1983-12-01), Wright

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