Electronic survey target

Details Electronic survey target Electronic survey target

1974-09-19

1976-08-03

Wilbur, Maynard R.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

33286, 33293, 250578, 356152, G01B 1126, G01C 1502

Patent

active

039726223

ABSTRACT:
A target for acquiring a swept light beam in which four light detectors arranged in a row are connected to operate respective illumination devices and also to a logic network which operates an audible signal only upon activation of all four or exclusively the center two detectors. The target includes a housing which attaches to and is movable upon a grade rod.

REFERENCES:
patent: 3527539 (1970-09-01), Studebaker
patent: 3588249 (1971-06-01), Studebaker
patent: 3588255 (1971-06-01), Alexander
patent: 3819273 (1974-06-01), Unema et al.
patent: 3846026 (1974-11-01), Waters
patent: 3857639 (1974-12-01), Mason
patent: 3894230 (1975-07-01), Rorden et al.

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