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MECHANICAL AND
ELECTRICAL PRINCIPLES
15
Fillure 11. Card Spacing
However, the sort magnet can be energized only on
12 points of this cycle. These 12 cycle points corres-
pond to the 12 punching positions on the card. The
remaining four cycle points represent the distance
from the 12 hole of one card to the 9 hole of the
following card.
Figure 12 shows a commutator disassembled. Note
the 13 contact spots near the center. Twelve of these
spots, each adjacent to the other, are internally con-
nected to the twelve segments on the inner (lower)
ring. Nine of these spots, representing the digits 1
through 9, may be connected to the digit common on
the extreme outer (upper) surface of the commutator
by means of the individual contact bars, the operation
of which is shown in Figure 12. 'The other three spots,
representing the 0, 11 and 12 values, may be con-
nected directly to the main common (outer) ring by
means of their individual contact bars.
The thirteenth contact spot
is
internally connected
to the digit common and, by means of its contact bar
(zone contact bar), maybe externally connected to
Figure 12. Commutator Assembly
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