Magnetic bearing plotting and sighting device

Details Magnetic bearing plotting and sighting device Magnetic bearing plotting and sighting device

1977-06-24

1978-04-04

Martin, Jr., William D.

Geometrical instruments

Straight-line light ray type

With magnetic compass

33262, 33274, 33355R, G01C 1712

Patent

active

040819124

ABSTRACT:
A device for taking and plotting magnetic bearings which includes an elongated straight edge device having numerical graduated indicia along one edge thereof, and a housing receiving said straight edge. A magnetic compass is mounted on the straight edge, and the housing includes folding portions adapted to enclose and protect the magnetic compass. A pair of sight pins are removably attachable to the compass and straight edge to provide a line of sight extending through the pivot point of the magnetized needle of the compass.

REFERENCES:
patent: 2680297 (1954-06-01), Vaucher
patent: 2822618 (1958-02-01), Wendel
patent: 3184854 (1965-05-01), Grasse
patent: 3191306 (1965-06-01), Kierans
patent: 3373429 (1968-03-01), Anderson

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