Excerpt from International Projectionist, Vol. 32: January 1957
Planetarium Projector. Actually a sys tem of individual projectors, the 12 foot long apparatus can throw on the artificial sky any number of patterns of stars, sun, moon, planets, and the Milky Way for any place or time. Oper ated by small 3-phase AC motors, the device can turn about independently on any one of three axes at different speeds.
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