Mechanical Image Acquisition With A Nipkow Disc
 

If you mis-spent your teenage years fishing broken televisions from dumpsters and either robbing them for parts or fixing them for the ability to watch The A Team upstairs rather than in the living room as I did, then it’s possible that you too will have developed a keen interest in analogue television technology. You’ll know your front porch from your blanking interval and your colour burst, you might say.

http://hackaday.com/2017/06/28/mecha...a-nipkow-disc/