Abstract :
AMONG principal components in the mail-processing scheme at Providence, R. I.´s automated post office are facer-cancellers. Letters and cards are placed in proper “stamp down” position by a combination of photoelectric cells and inverting belts at a rate of 25,000 an hour. The “electric eye” system also determines whether stamp is on leading or following edge, separating mail on this basis for high-speed cancelling heads.
