"
"It's not supposed to punch until the whole card is ready," the other
explained. "You depress into position the various keys you want until
all the records needed for this one card are ready. Then you can glance
over your keyboard, comparing what might be called your map of depressed
keys with the line of the schedule you are copying. If one is wrong, you
can release that one and put down the correct one in its place, the card
being as yet untouched. You see, each field or division of the card
corresponds with a differently colored section of the keyboard, and this
makes it easy to insure accuracy in reading from the schedule."
"But how is the punching done, then?" queried Hamilton.
"You press the bar," the foreman explained, "and that throws in the
motor attached to the punching mechanism, which brings the entire die
and card up against the end of the punches which have been depressed by
the operator, including, of course, the gang-punch, and these perforate
the card. It is then immediately withdrawn, and drops automatically into
either the 'male' or the 'female' compartments of the machine, the
location of the hole tilting the slide that determines on which side the
punched card shall fall.
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