Williams, F C, and Kilburn, I, A Storage System for Use with Binary Digital Computing Machines, ProcIEE, Part III, No.40 (March, 1949).
The Williams tube was initially based on the CV1131, a commercially available 12-inch (300 mm) diameter CRT, but a smaller 6-inch (150 mm) tube, the CV1097, was used in the SSEM.

A Williams-Kilburn tube

Display on screen. Image formed by the focus method
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