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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. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.