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Einstein and William Campbell in front of 100″ telescope at Mt. Wilson
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