Optics: measuring and testing – Angle measuring or angular axial alignment – Alignment of axes nominally coaxial
Patent
1979-05-22
1981-06-09
Rosenberger, Richard A.
Optics: measuring and testing
Angle measuring or angular axial alignment
Alignment of axes nominally coaxial
33286, 356399, G01B 1127
Patent
active
042721911
ABSTRACT:
A device for indicating an angle or direction of pipes in pipelaying operations in which two screen units are disposed in a predetermined spaced relation in a housing placed in a pipe section to measure the angle of the pipe. The two screen units each have opaque lines separated by transparent gaps, the opaque lines being in the form of concentric circles of the screens being disposed in the housing with the circles of both screens being mutually concentric. When observing the pattern through the screens, the circles of the two screens form interference patterns, i.e., moire patterns representative of the angle of the device relative to line of sight of the viewer.
REFERENCES:
patent: 3572942 (1971-03-01), Tekronnie et al.
patent: 3604813 (1971-09-01), Tekronnie et al.
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