Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Brattain Walter F4

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Brattain Walter F4

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Image title: 
The Transistor
Credit line: 
Photograph by Nick Lazarnick, Alcatel-Lucent/Bell Labs, courtesy AIP Emilio Segrè Visual Archives, Brattain Collection

'Release: A.M. Papers of Thursday, July 1, 1948. The Transistor, Bell Telephone Laboratories' latest contribution to electronics and electrical communication. Working on an entirely new physical principle discovered by the Laboratories in the course of fundamental research into the electrical properties of solids, the device will serve as an amplifier or an oscillator -- perform nearly all the functions of an ordinary vacuum tube, but involves no vacuum, no glass envelope, no grid, no plate, no cathode and therefore no warm-up delay. Contained in the simple metal cylinder are two extremely fine wires, whose points rest on a small dot of semi-conductive material soldered to a metal base. The Transistor has been shown to produce amplification as high as 100 to 1 (20 decibels). Some test models have been operated as amplifiers at frequencies up to ten million cycles per second.'

Photo date: 
Original format: 
1 photographic print (black and white; 9.5 x 7 inches)
Brattain, Walter H. (Walter Houser), 1902-1987
Shockley, William, 1910-1989
Bardeen, John