For the benefit of fascinated multitudes in four of the biggest U. S. citiesChicago, Philadelphia, New York, Los Angeles planetaria project artificial stars on artificial skies by means of big, complicated, dumbbell-shaped projectors, made by Zeiss and imported from Germany. Present price of a Zeiss instrument is around $130,000.
Unveiled last week in Springfield, Mass., was a homebuilt projector which cost less than $12,000. It was built by able, earnest Frank Korkosz, technician of Springfield's Museum of Natural History. Not dumbbell-shaped but spherical, the Korkosz instrument projects on a 40-ft. (diameter) hemispherical ceiling...
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