Mechanical television

https://en.wikipedia.org/wiki/Mechanical_television



http://hackaday.com/2010/04/13/mechanical-scanning-television/

http://www.earlytelevision.org/mechanical_tv.html

http://bs.cyty.com/menschen/e-etzold/archiv/TV/mechanical/scanningdisc.htm

http://www.home1.stofanet.dk/television/

http://www.home1.stofanet.dk/television/pjgn.html