Geometrical instruments – Straight-line light ray type – With magnetic compass
Patent
1977-05-02
1979-06-19
Martin, Jr., William D.
Geometrical instruments
Straight-line light ray type
With magnetic compass
58 89, G01C 1706
Patent
active
041582608
ABSTRACT:
A wrist compass is formed with a base member having straps at each side for strapping to a user's wrist and with a detachable compass body having complementary interengaging surfaces for removably securing the compass body to the base member. The base member also is provided with folding lens and sight line elements to overlie the attached compass face in a folded position and to be erected to a sighting position when desired. The lens and sight line elements are preferably formed entirely of transparent material so that the compass face is visible when the elements are folded thereover.
REFERENCES:
patent: 2358589 (1944-09-01), Piffath
patent: 4017878 (1977-04-01), Hagiwara
Benger Richard T.
Pollack Benjamin D.
Hatfield Dos T.
Martin, Jr. William D.
Pollack Benjamin D.
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