Zero setting device in surveying instrument

Details Zero setting device in surveying instrument Zero setting device in surveying instrument

1986-08-26

1987-10-27

Little, Willis

Geometrical instruments

Miscellaneous

Light direction

33 1PT, G01C 100

Patent

active

047020083

ABSTRACT:
A surveying instrument for measuring a rotation angle in which a rotation angle is measured from a reference direction and is displayed. The reference angle is set by zeroing the displayed angle. The display is zeroed only if a reset button is operated twice within a fixed period.

REFERENCES:
patent: 4072893 (1978-02-01), Huwyler
patent: 4466189 (1984-08-01), Tobin, Jr.

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