Planetarium alarm clock

Details Planetarium alarm clock Planetarium alarm clock

1983-07-27

1985-02-05

Miska, Vit W.

Horology: time measuring systems or devices

Astronomical

368 72, 434287, G04B 1926

Patent

active

044975821

ABSTRACT:
A hemispherical dome of opaque thin material is pierced with small openings in patterns conforming to the appearance of constellations in the sky. Mounted on a rotating cylinder, the dome is turned by an electric motor at adjustable speeds. A light source within the dome casts patterns of the constellations about the room. The control for the motor is wired into an alarm clock so that the speed of rotation may simulate the earths rotation. Turning the alarm on may activate the planetarium upon awakening the user. A "sleep cycle" on the alarm may operate the planetarium for a specified period before turning off automatically allowing the user to fall asleep with the planetarium activated. Opaque mask hemispheres which fit snugly over the planetarium dome are each provided with a single cut-out portion shaped to expose only one constellation at a time for projection. Light bulbs with variously shaped filaments will project the shape of each filament into the room.

REFERENCES:
patent: 2230039 (1941-01-01), Jones
patent: 2366470 (1945-01-01), Annis
patent: 3248866 (1966-05-01), Spilhaus
patent: 3766727 (1973-10-01), Didik

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