This is not the complete

#214436
AvatarJamie
Member

This is not the complete answer I know, but it’s something to do with US electricity current during the film era to assure the projectors ran at the same speed. Europe has 50hz AC, (PAL50) and North America has 60hz. (NTSC 60) an divisions from this. It was just a simple dividing circuitry used to synch the motor of the projectors.

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