Geographical sundial

Details Geographical sundial Geographical sundial

1984-03-14

1985-06-04

Martin, Jr., William D.

Geometrical instruments

Straight-line light ray type

Celestial

33 1SA, 368 15, 434288, G04B 4902

Patent

active

045205728

ABSTRACT:
A sundial comprising a transparent hollow globe marked with latitude and longitude lines and including a map of the world is mounted on a stationary base. The globe is adjustable with respect to the base to enable the polar axis to be inclined toward a geographic pole of the earth and to permit alignment of a desired geographic location on the map with an index point. A reflector is mounted at the center of the globe and focuses an image of the sun onto the interior surface of the globe. The image traverses the globe as the earth rotates, thereby tracking the actual path of the sun with respect to the earth on the globe surface.

REFERENCES:
patent: 89585 (1869-05-01), Johnson
patent: 358957 (1887-03-01), Benson
patent: 849475 (1907-04-01), Hewitt
patent: 1674161 (1928-06-01), de Bogory
patent: 2164532 (1939-07-01), Leinert
patent: 3786570 (1974-01-01), Davies
patent: 4387999 (1983-06-01), Shelley

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