Science: Homemade Sky

For the benefit of fascinated multitudes in four of the biggest U. S. cities—Chicago, 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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