Shadowless sundial

Details Shadowless sundial Shadowless sundial

1980-09-17

1982-07-13

Martin, Jr., William D.

Geometrical instruments

Straight-line light ray type

Celestial

G04B 4900

Patent

active

043387276

ABSTRACT:
A sundial is disclosed comprising specularly reflective convex surfaces that form virtual images of the sun in a separate plane or conical surface in which a numbered dial plate is mounted. The axis of revolution of the curved surfaces is mounted parallel to the axis of rotation of the earth and the time scale is also centered about this axis, but in a separate plane or cone located at a distance below the nearest reflective convex surface equal to the radius of said convex surface.

REFERENCES:
patent: 2668357 (1954-02-01), Whipple
patent: 2846768 (1958-08-01), Putnam
patent: 3786570 (1974-01-01), Davies
patent: 3815249 (1974-06-01), Gundlach

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