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microscopic capacitors that are topped up every few microseconds.
During the post-war years, the Americans also used phosphor dots to store data. Encouraged by the Institute for Advanced Study's computing pioneer John von Neumann, the Radio Corporation of America (RCA) began work on its Selectron tube in 1946.
This space age device was about the size of a child's forearm and, with a cathode running up the middle, was packed with electronics. Different models could store from 256 to 4,096 bits of data on individual phosphor dots. The 256-bit Selectron was projected to cost about $500 to build, and it was both faster and more reliable than the Williams Tube.
However, the Selectron was complex to make and expensive to produce, so engineers began to develop other weird and wonderful forms of memory. Delay lines –
The idea was to convert individual bits into mechanical vibrations and