Geometrical instruments – Straight-line light ray type – Instrument support
Patent
1979-03-05
1981-08-04
Stephan, Steven L.
Geometrical instruments
Straight-line light ray type
Instrument support
33285, 33292, G01C 100
Patent
active
042814634
ABSTRACT:
Angle measuring apparatus such as a transit has a pair of superimposed discs which are rotatable with respect to each other. One of the discs is rotatable with a viewing telescope support which has a vertically extending rotatable shaft received in a stationary shaft. A commercially available bearing is used between the shafts with the inner race fitted to the rotatable shaft and the outer race to the stationary shaft. The outer race of the bearing further carries the other of the disc.
REFERENCES:
patent: 2164051 (1939-06-01), Brunson
patent: 3930694 (1976-01-01), Acker et al.
Kobayashi Yuzi
Nishikatsu Hiroshi
Stephan Steven L.
Tokyo Kogaku Kikai Kabushiki Kaisha
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