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Donald S. Clark (standing) with students in the metallurgy lab
Wind tunnel class
200″ mirror
200″ mirror
Wind tunnel class--Naval Ensign Aeronautical Engineering Summer Course
Time and Motion Study class
Arthur H. Young
Arthur H. Young
Caltech military meteorology class
William Pickering and others
Josef Johnson at the 18″ Schmidt telescope
Robert Gray
200″ disc on table of 200″ machine
200″ telescope at Palomar
Robert Millikan and GALCIT Aeronautics Faculty