The Williams-Kilburn tube was also used by IBM. The scheme was patented in 1946 by Dr F C Williams and developed in conjunction with Tom Kilburn and Geoff Tootill over the next two years before incorporation in the Manchester (UK) Mark 1 computer which was commercially developed as the first Ferranti machine. This enabled a clearer display to be achieved. Because the actual storage tube was fully enclosed a repeater tube and display was used. This shows a typical display on the tube face. A system of continuous read and re-writing is required to preserve the data. The whole assembly had to be very well screened to prevent external interference.īy scanning the tube area it is possible to store multiple data bits and to rapidly read them. On the drop-down cover can be seen the circular metal disc which was placed in contact with the front of the screen and which picked off the charge. The presence or absence of this charge can be detected when the beam again strikes the same area there is a difference in the small voltage appearing on the outside of the face of the tube.Ī standard but selected radar display tube was used. This relies on the fact that a small electrostatic charge appears on the inside face of the cathode ray tube where the electron beam hits the surface and that this charge remains for a short period of time before leaking away. Before the advent of the magnetic core store system for fast read and write computer memory (RAM), the most sucessful was the CRT system.
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