In pictures: Transistor history
![ENIAC computer](http://newsimg.bbc.co.uk/media/images/44233000/jpg/_44233920_eniac_spl_416.jpg)
![Shockley, Bardeen, and](http://newsimg.bbc.co.uk/media/images/44233000/jpg/_44233922_shockley_220.jpg)
Vacuum tubes were replaced by
transistors - a type of electronic switch - invented by William
Shockley, John Bardeen and Walter Brattain at Bell Labs.
![First transistor](http://newsimg.bbc.co.uk/media/images/44233000/jpg/_44233923_transistor.jpg)
The first working transistor was shown off just before Christmas in 1947, but was only revealed to the public six months later.
![Electronics magazine](http://newsimg.bbc.co.uk/media/images/44233000/jpg/_44233919_electronicsmagazine.jpg)
In 1965 the Intel co-founder Gordon
Moore, writing in Electronics magazine, correctly predicted that the
number of transistors on a chip would double every year.
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