Apparatus for fine adjustment of a sextant

Details Apparatus for fine adjustment of a sextant Apparatus for fine adjustment of a sextant

1989-01-23

1991-07-16

Haroian, Harry N.

Geometrical instruments

Straight-line light ray type

Vertical angle

G01C 102

Patent

active

050313274

ABSTRACT:
A drum screw with measuring drum for fine setting of a sextant includes a coaxial setting ring. The ring, which includes a vernier scale, is rotatable independently of the measuring drum to permit the user to avoid the tiresome zero correction and the need to consider correction factors in calculating location.

REFERENCES:
patent: 2439102 (1948-04-01), Rothweiler
patent: 3484942 (1969-12-01), Toubhans
patent: 3698090 (1972-10-01), Parone
patent: 4656878 (1987-04-01), Iwai et al.

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