"Electric Spirograph"
Hi,
In 1971 or '72, my father had bought a toy that was called (or at least resembled) a battery-operated Spirograph.
From what I remember, it stood upright and there were two slots where you could put transparent glass/plastic discs that had various Spirograph-like designs on them.
After inserting, you would turn the machine on and it would rotate the disks and project light through them onto a common projection screen -- by varying the rotational speed of the disks you could alter the rotational harmonics on the screen.
Was very cool to a three year-old.
What I am looking for is: the name? Who was the manufacturer?
Thanks
Doug
