I was hoping this would be some new fangled way of viewing magic eye images mapped onto the inside of a tube through something like polar coordinates and viewed like a kaleidoscope. I was disappointed.
I remember playing with my father's collection of tape recorders when I was young and one of them had such a "cat's eye". Maybe that's where my love for glowing phosphors started.
It is likely to have either been the recording level indicator on an old valve reel-to-reel tape recorder, or the tuning indicator on an old valve FM radio.
I was hoping this would be some new fangled way of viewing magic eye images mapped onto the inside of a tube through something like polar coordinates and viewed like a kaleidoscope. I was disappointed.
I think the vaccum tube that it turns out to be is even cooler.
I remember playing with my father's collection of tape recorders when I was young and one of them had such a "cat's eye". Maybe that's where my love for glowing phosphors started.
I remember as a kid some device had one of these, but I can't for the life of me remember what it was.
It is likely to have either been the recording level indicator on an old valve reel-to-reel tape recorder, or the tuning indicator on an old valve FM radio.
Related:
The Magic-Eye Tuning Indicator, W G Morley, The Radio Constructor, March & April, 1969:
https://www.r-type.org/articles/art-137.htm