Horizon indicating device for marine sextant

Details Horizon indicating device for marine sextant Horizon indicating device for marine sextant

1975-09-05

1977-02-01

Corbin, John K.

Optics: measuring and testing

Angle measuring or angular axial alignment

Apex of angle at observing or detecting station

33283, 356250, G01C 1514

Patent

active

040059383

ABSTRACT:
A horizon indicating device adapted to be mounted behind the horizon glass of a conventional marine sextant, comprising a wire indicator which is kept always in a horizontal position with two sets of pivotal axis forming a two dimensional universal support to cope with a rolling and pitching ship. The said device enables the sextant to function normally under poor visibility when the real horizon can not be seen. The self-illuminated wire indicator makes the sextant being able also to work during night time.

REFERENCES:
patent: 269486 (1882-12-01), Tennent
patent: 544212 (1895-08-01), Croskery
patent: 1891641 (1932-12-01), Habel

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