A surveying instrument having means for transmitting signals bet

Details A surveying instrument having means for transmitting signals bet A surveying instrument having means for transmitting signals bet

1978-10-30

1981-07-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

350 23, G02B 2702

Patent

active

042800579

ABSTRACT:
A survey instrument having an alidade portion and a fixed portion rotatably holding the alidade portion. The survey instrument comprises a light-emitting portion provided in at least one of the alidade portion and the fixed portion, a light-receiving portion provided in the other of the alidade portion and the fixed portion so as to make a pair with the light-emitting portion, and a transmission optical system for directing to the light-receiving portion the beam emitted from the light-emitting portion.

REFERENCES:
patent: 3256766 (1966-06-01), Allesson
patent: 3895871 (1975-07-01), Strasser
patent: 3977793 (1976-08-01), Trotta
patent: 4038547 (1977-07-01), Hoesterey
patent: 4055058 (1977-10-01), Tewsley et al.
patent: 4109998 (1978-08-01), Iverson
patent: 4166959 (1979-09-01), Ivie

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