Oh dear, oh dear - you don't remember your history do you
The world's second computer - the Manchester Mark 1 (disclosure, I went to Cambridge, and so would argue vociferously that Cambridge beat Manchester in the race) - had the "William's tube" CRT memory in 1946:
http://www.cedmagic.com/history/williams-tube.html
And here is another photograph of CRT memory:
http://en.wikipedia.org/wiki/File:CRT_memory.jpg