Latitude finder

Details Latitude finder Latitude finder

1980-10-10

1982-06-08

Martin, Jr., William D.

Geometrical instruments

Straight-line light ray type

Celestial

33270, 33283, G01C 2120

Patent

active

043332439

ABSTRACT:
An apparatus for indicating the latitude position of the user is disclosed. The apparatus comprises a base member carrying a scale having degrees of latitude marked on the scale. The base member further carries a scale correcting for the declination of the sun north or south of the equator during days of the year. A vertical member extends perpendicularly upwardly from the base member and carries a means alignable with the current day date when the base member is oriented in a meridian plane and rotated in a vertical plane. When the base member is oriented in a north-south direction and the means aligned to the current date, the end of the shadow cast by the vertical member on the scale of degrees of latitude indicates the latitude position of the user.

REFERENCES:
patent: 396883 (1889-01-01), Lawrence
patent: 849841 (1907-04-01), Goode
patent: 972889 (1910-10-01), McCallister
patent: 1034767 (1912-08-01), Cheifetz
patent: 2094833 (1937-10-01), McAuliffe
patent: 2412831 (1946-12-01), Owens
patent: 3947973 (1976-04-01), Dunn

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