Geometrical instruments – Straight-line light ray type – Celestial
Patent
1990-08-24
1991-10-15
Shoap, Allan N.
Geometrical instruments
Straight-line light ray type
Celestial
33270, G04B 4900
Patent
active
050562320
ABSTRACT:
A remote light source responsive time indicator includes a preferably cylindrical body of transparent material with a light receiving and refracting surface on one side and an axial image producing surface on a remaining side. The image producing surface may be formed as a translucent surface on the body, integrated therewith or applied thereto. Angularly spaced axial time indicia is also provided on the image producing side. The body is preferably supported on a base so the light receiving and refracting side faces upwardly and the image producing side faces downwardly. Sunlight received through the light receiving and refracting surface is concentrated optically through the transparent body and an intense visible image of the light is made to appear on the opposite side by provision of the image producing surface. This image moves with the sunlight across the image producing surface and indicates time in hourly increments when associated with the angularly spaced indicia. A second body may also be provided and is held horizontal to indicate seasonal time changes. The second body makes use of similar light receiving and image producing surfaces, with seasonal indicia provided in place of the hourly indicia. The bodies may be rotated about their respective central axes to facilitate initial time and seasonal settings.
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B. Sirius Toys, Inc.
Shoap Allan N.
Wirthlin Alvin
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