= Walter Brattain
{c}
{tag=Physicist}
{title2=1902–1987}
{wiki}
= Walter Houser Brattain
{c}
{synonym}
= Walter H. Brattain
{c}
{synonym}
= W. H. Brattain
{c}
{synonym}
<Walter Brattain> and <John Bardeen> demonstrated amplification with a <point-contact transistor>. Closely spaced contacts on a <semiconductor> allowed a small controlling signal to alter the current in another circuit. Injection and transport of carriers near the surface made the solid an active amplifier, rather than only a passive resistor. Their report connects <semiconductor> surface physics with a practical three-terminal electrical device.<The Transistor, A Semi-Conductor Triode by John Bardeen and Walter Houser Brattain>[Physical Review 74, 230 (1948), point-contact amplification]{ref}
A <physicist>.<Walter Houser Brattain by John Bardeen>[Independent professional profile]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Brattain.jpg?width=260]
{title=Portrait of <Walter Brattain>}
{description=Nobel foundation; 1956. Public domain in Sweden (PD-Sweden photograph). https://commons.wikimedia.org/wiki/File:Brattain.jpg[Source usage terms], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Brattain.jpg}
{width=260}
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