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Title: Cloud chamber photo of tracks of a positron
Format: photograph: negative
Date: 1932-08-02
Series: Individuals, Anderson, Carl D.
Description: On August 2, 1932, while photographing cosmic-ray tracks in a cloud chamber, Carl Anderson captured on film the track left behind of the first clearly identified positive electron. This photograph shows the particle moving upward, as determined by the increase in curvature of the top half of the track after it passed through the lead plate, and curving to the left, meaning its charge is positive. Anderson won the Nobel Prize in physics in 1936 for this discovery., Carl Anderson Papers 5.10.

Title: A small cosmic-ray shower of positive and negative electrons (7900 gauss magnetic field)
Format: photograph: negative
Series: Individuals, Anderson, Carl D.
Description: Image was part of Carl D. Anderson’s Nobel Lecture presented before the Swedish Royal Academy of Science at Stockholm, December 12, 1936.

Title: Cloud chamber photo of a muon passing through a geiger counter and stopping in the gas of a cloud chamber
Format: photograph: negative
Series: Individuals, Anderson, Carl D.
Description: The muon particle was discovered by Carl Anderson., Carl Anderson Papers 5.9 and 5.10.

Title: 1911 Pierce Arrow
Format: photograph: negative
Series: Individuals, Anderson, Carl D.
Description: This 1911 Pierce Arrow spent several years parked in an alley next to the aeronautics building. It housed a motor generator--donated by alumnus Frank Capra--that provided power for the cloud chamber magnet used in experiments that won a Nobel Prize for Carl Anderson.

Title: Positron and electron tracks
Format: photograph: negative
Series: Individuals, Anderson, Carl D.
Description: Cloud chamber photo shows tracks of electrons and positrons. The particles come down from the top and as they move into a magnetic field, the electrons move to the left, and the positrons to the right.