Planetarium with star identifying means

Details Planetarium with star identifying means Planetarium with star identifying means

1976-07-30

1977-09-06

Grieb, William H.

G09B 2700

Patent

active

040458857

ABSTRACT:
A pin hole type star globe of a planetarium is provided with star identifying means for intermittently interrupting light projected through a pin hole of the star globe to form a star image on a viewing screen, thereby causing a perceptible, identifying blinking of said star image. The star identifying means includes an occluding arm which may be caused to swing back and forth into and out of interference with reference to the projected light; such swinging being caused by electrical, radio frequency means, controlled by step operating switching means.

REFERENCES:
patent: 2168799 (1939-08-01), Korkosz et al.
patent: 3228120 (1966-01-01), Farrell
patent: 3552037 (1971-01-01), Stern

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