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Title: Clark Millikan
Format: photograph: negative

Title: John Todd, formal portrait
Format: photograph: print

Title: Aerial view of the campus
Format: photograph: print
Series: Campus and Student Life
Description: Campus Aerial Views.

Title: Theodore von Karman
Format: photograph: print

Title: Navy class at Caltech
Format: photograph: print

Title: Lt. Col. Goldsworthy
Format: photograph: print
Series: Administration
Description: Master Student Houses. Administration.

Title: Morris Dam reservoir, San Gabriel Mountains.
Format: photograph: negative
Description: During WWII, rockets and torpedoes were tested here by Caltech scientists. Carl Anderson Papers.

Title: Paul MacCready as boy
Format: photograph: print
Description: By the age of 15, Paul MacCready was already winning laurels in gas-powered model airplane competitions. In this photo he poses with his model “Topper”, circa 1940, which won trophies in two classes by swapping out two different sized engines on the same plane.

Title: JPL or Aerojet group
Format: photograph: negative

Title: Security stopwatch
Format: photograph: print
Description: One jewel analog Swiss security stopwatch.

Title: Magnetic relay for electronic switching
Format: photograph: negative
Description: Developed in the 1940s or 1950s for Bell System automatic switching, by R.M. Bozorth (CIT 1922). Mfg. Bell Labs.

Title: Potentiometer, type K-2
Format: photograph: negative
Description: Serial no. 279092. Appears to be Leeds and Northrup model K-2, with some modification to the dials on the right side. See L&N catalog E-50B(3), 1940. Mfg: Leeds and Northrup, Philadelphia, PA.

Title: Aviation altimeter
Format: photograph: print
Description: Kollsman war surplus aviation altimeter.

Title: Army air force bubble sextant
Format: photograph: print
Description: Battery operated, night reading, cylinder recording, bubble sextant for measuring latitude.

Title: Tower drafting set
Format: photograph: print
Description: Comprised of dividers and compasses. Manufactured in Germany.

Title: Keuffel and Esser Le Roy lettering set
Format: photograph: print
Description: Used for drafting. Housed in wooden box.

Title: Wrico lettering set
Format: photograph: print
Description: Used for drafting. Housed in bakelite box.

Title: Spectrophotometer, quartz
Format: photograph: negative
Description: Serial D-282. Phototube housing and lamp housing directly attached to main unit. Attached by cord is undistinguished light gray metal box (power supply regulator?) Mfg. National Technical Laboratories, South Pasadena, CA.

Title: Triode, high frequency (door knob), WE 316A
Format: photograph: negative
Description: Used mainly in GE IFF radio in 1943. Mfg. Western Electric.

Title: Radar switch tube
Format: photograph: negative
Description: Russian copy of Western Electric Mark II 5D21, anti-submarine radar switch tube by H. E. Mendenhall (CIT 1927), J. Westsan and C.H. Elmendorf (CIT 1936). Found on Oregon beach ca. 1948.

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