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Title: The 200-Inch Telescope Looking Northwest
Format: drawing
Date: 1939

Title: Wedge ball-and-socket mounting for the base frame
Format: photograph: print
Date: 1939
Series: Academic Divisions

Title: One of the observing floor hatch covers used as a painters’ scaffold
Format: photograph: print
Date: 1939
Series: Academic Divisions

Title: Caltech high voltage laboratory
Format: photograph: print
Date: 1939
Description: View from the catwalk.

Title: Pentode, Western Electric 282A
Format: photograph: negative
Date: 1939
Description: Used on the first ship to shore transmission (S.S. Vaterland) and for the first airplane transmitter by H.E. Mendenhall and Lewellyn. Mfg. Western Electric.

Title: Earnest C. Watson, portrait
Format: photograph: print
Date: 1939
Description: Watson Papers.