Alex The G and T
Thar! That Blows.
Mind the gap.
I remember looking around Bletchley park when the Sealed Knot did a display there once, but I have never been there since it became more organised. I guess it being on my doorstep when I lived in Milton Keynes meant I rather took it for granted and never got around to visiting again.The tape-reader drive on the Bletchley Park "Colossus" code-breaking computer, circa 1944.
View attachment 114165
I think that is photoshop. it includes a Viewmaster disc which was smaller than that and which was viewed through binocular lenses rather than the apparent CRT display shown here.