Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Brattain Walter H1

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Brattain Walter H1

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Image title: 
Transistor Effect Notes
Credit line: 
Alcatel-Lucent/Bell Labs, courtesy AIP Emilio Segrè Visual Archives

The laboratory notebook entry of scientist Walter H. Brattain records the events of December 23, 1947, when the transistor effect was discovered at Bell Laboratories.

Photo date: 
Original format: 
3 photographic prints (black and white; 9.5 x 7.5 inches)
Brattain, Walter H. (Walter Houser), 1902-1987