Blue top setting device

Details Blue top setting device Blue top setting device

1984-05-08

1986-02-04

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33296, 33295, 33147C, G01C 504

Patent

active

045676690

ABSTRACT:
A first rod includes a relative elevation scale and a first fluid container vertically adjustable with respect to the relative elevation scale to a position corresponding to a desired elevation relative to the base of the first rod, and a second rod includes a second fluid container of substantially lesser cross sectional area than the first fluid container, a predetermined level of fluid in the second fluid container indicating that the base of the second rod is at a desired elevation relative to the base of the first rod.

REFERENCES:
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patent: 327564 (1885-10-01), MacDonald
patent: 547864 (1895-10-01), Sherman
patent: 914945 (1909-03-01), Gutwein, Jr.
patent: 1042248 (1912-10-01), McGowan
patent: 1463738 (1923-07-01), Dickinson
patent: 1599347 (1926-09-01), Purkey
patent: 2614572 (1952-10-01), Wisney
patent: 2789364 (1950-04-01), Selleck
patent: 3015167 (1962-01-01), Chapman
patent: 3849898 (1974-11-01), Turloff
patent: 4041613 (1977-08-01), Bishop
patent: 4231163 (1980-11-01), Turloff

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