Vial

Details Vial Vial

1991-01-23

1991-12-24

Haroian, Harry N.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

G01C 504, G01C 922

Patent

active

050740490

ABSTRACT:
A level vail includes a pair of elongated tubes, each having a top open end and a bottom open end. A pipe has two ends, respectively connected to the bottom ends of the elongated tubes. Water is contained in each of the elongated tubes, in each of which a floating article is also provided. A communicating member is provided on the top open end of each of the elongated tubes. One communicating member has at least one passage which communicate the interior of the elongated tube and the external atmsophere. A blocking member is movably disposed in the communicating member so that the passage of the communicating member can be opened and closed selectively.

REFERENCES:
patent: 375450 (1987-12-01), Karr
patent: 1576470 (1926-03-01), Richardson
patent: 2150048 (1939-03-01), Boyd
patent: 3183716 (1965-05-01), Lyon
patent: 4991302 (1991-02-01), Brewer

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