Holographic sundial

Details Holographic sundial Holographic sundial

1996-01-23

1998-03-31

Will, Thomas B.

Geometrical instruments

Straight-line light ray type

Celestial

G01C 1734

Patent

active

057324735

ABSTRACT:
A holographic sundial comprising a hologram made using a holographic recording apparatus including a light-sensitive recording medium, a three-dimensional model, in one or more parts, bearing a plurality of indicia over a range of angles corresponding to hour angles of the sun, illumination of the three-dimensional model such that light is incident on the light-sensitive recording medium from every angle of the three-dimensional model in a manner conformal to the represented hour angle, and a reference ray of light incident on the recording medium from one angular direction which defines the angular direction for viewing the recorded image. The hologram, under direct illumination by light from the sun, produces a continuously varying image which indicates the time of day.

REFERENCES:
patent: 4237611 (1980-12-01), Wurch et al.
patent: 4782472 (1988-11-01), Hines
patent: 5056232 (1991-10-01), Cunningham
patent: 5590093 (1996-12-01), Scharstein et al.
patent: 5596553 (1997-01-01), Kellogg
A. Gongora-T and Robin G. Stuart, Holographic Sundial, Applied Optics, vol. 29, No. 32, pp. 4751-4752, Nov. 1990.

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