Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1995-07-14
1997-08-26
Will, Thomas B.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33379, 33 1LE, G01C 928
Patent
active
056599676
ABSTRACT:
A line level comprises a hollow housing having a pair of end portions and a sight opening formed therein. A liquid level indicator has a pair of closed end walls and is observable through the sight opening is slidably received in the housing. A line engaging retainer arrangement is slidable into an interference fit in each of the open end portions of the housing and is engageable with each of the closed end walls of the liquid level indicator for maintaining the position of the liquid level indicator relative to the sight opening in the housing.
REFERENCES:
patent: 839751 (1906-12-01), Grunewald
patent: 991446 (1911-05-01), Johnson
patent: 1716744 (1929-06-01), Stowell
patent: 1785296 (1930-12-01), Christensen
patent: 2014709 (1935-09-01), Volz
patent: 3593428 (1971-07-01), Jacoff
patent: 3878617 (1975-04-01), West et al.
patent: 4068386 (1978-01-01), Streeter
patent: 5044087 (1991-09-01), McAuslin
Johnson Level & Tool Mfg. Co. Inc.
Will Thomas B.
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