Combination geodetic transit compass and signal mirror

Details Combination geodetic transit compass and signal mirror Combination geodetic transit compass and signal mirror

1980-07-10

1983-08-02

Martin, Jr., William D.

Geometrical instruments

Straight-line light ray type

With magnetic compass

33275R, 33348, 116 20, 350 98, G01C 1720

Patent

active

043958281

ABSTRACT:
A geodetic compass having a mirrored cover that has the dual purpose of providing means for reading the compass needle orientation for geodetic purposes, while at the same time having cross hatch diffractional sighting means incorporated in said cover and mirror for utilizing said mirror for emergency signalling purposes.

REFERENCES:
patent: 823373 (1906-06-01), Tatum
patent: 1042079 (1912-10-01), Brunton
patent: 2358589 (1944-09-01), Piffath
patent: 2557108 (1951-06-01), Hunter
patent: 3164124 (1965-01-01), Ehrsam

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