Geometrical instruments – Straight-line light ray type – Rod or target
Patent
1993-06-10
1995-03-28
Wirthlin, Alvin
Geometrical instruments
Straight-line light ray type
Rod or target
33299, 248169, G01C 1506
Patent
active
054005167
ABSTRACT:
An adjustable stand developed to facilitate an accurate measurement of vertical distances from a surface, on which at least one leg of the stand rests to a given point above that surface. The surface may be either ground surface or a surveyor's hub on a stake. The stand has two legs one leg of which is both a distance measuring device and a plumb finder by which the verticality of the leg may be ascertained. The second leg is formed of two spaced apart beams to provide stability, the beams having pointed ends for insertion into the surface on which the device stands.
REFERENCES:
patent: 1139990 (1915-05-01), Merrill
patent: 1217713 (1917-02-01), Cotter
patent: 3110109 (1963-11-01), Brittenham et al.
patent: 3570130 (1971-03-01), Boehm
patent: 4290207 (1981-09-01), Browning et al.
patent: 4378638 (1983-04-01), Harder
patent: 4767090 (1988-08-01), Hartman et al.
De Koster Lucas J.
Wirthlin Alvin
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