Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1981-12-04
1983-12-27
Swisher, S. Clement
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
73432HA, G01C 504
Patent
active
044222440
ABSTRACT:
An elevation indicator comprising a supporting base, a reservoir for holding liquid supported on the base, an elongated staff and a flexible tube extending from the staff to the reservoir. An elongated scale is mounted on the staff for longitudinal movement relative to the staff and a transparent tube is also mounted on the staff and extends along one side of the staff adjacent the scale. A check valve is located at the top of the transparent tube and the bottom of the transparent tube is connected to the flexible tube, so that liquid can flow between the reservoir and the transparent tube.
REFERENCES:
patent: 277037 (1883-05-01), Le Grande
patent: 914945 (1909-03-01), Gutwein
patent: 1478384 (1923-12-01), Dorsch
patent: 1488749 (1924-04-01), Franz
patent: 2150048 (1939-03-01), Boyd
patent: 2664645 (1954-01-01), Qualman
patent: 2789364 (1957-04-01), Selleck
patent: 3117381 (1964-01-01), Durkin
patent: 3577645 (1971-05-01), Zurawski
patent: 3849898 (1974-11-01), Turloff
patent: 4041613 (1977-08-01), Bishop
patent: 4161069 (1979-07-01), Cubeta
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