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Palomar site
Sir James Jeans and Walter Adams, interior of 100″ at Mt. Wilson
Workmen positioning 200″ disc
Plugging vacuum leaks in the Kellogg 2 MV x-ray tube using a brush with thickened shellac
Einstein, Hubble and others at Mt. Wilson
Sir James Jeans
Robert Millikan and Alexander Goetz
Workmen positioning 200″ disc