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62
SPECIAL
DEVICES
Zero-Elimination
The multiple column selection device permits greater
speed in the completion of either alphabetic or numeri-
cal sorting operations through the automatic rejection
of cards which require a reduced amount of sorting.
Cards can
be
rejected during a numerical sorting
operation whenever the columns wired at the left and
the column being sorted all contain only O's, l1's, 12's
or are blank. These rejected cards do not require
further sorting because they contain sorting codes lower
than those in the remaining cards and, therefore, are
available for immediate report preparation or other
machine operations. If the column being sorted is
blank, punching from 1
to
9 in any column wired to
the left of the sorting position will cause the card to
sort into the 12 pocket. If 0, 11, or 12 punching occurs
in the column being sorted, and a value of 1 to 9
punching occurs in any column wired to the left of the
sorting position, the card will sort into the corresponding
0, 11, or 12 pocket. If punching from 1 to 9 occurs in
the column being sorted, the card will sort into the
corresponding pocket, regardless of what punching may
or may not be sensed in those positions wired
to
the
left of the sorting position.
position set to
SELECT.
As sort jng
proceeds for 1 D's, 1
~O's
position,
etc., these switches are successive-
ly
set to
SOR1.
10
9
8
BRUSHES
The zero-elimination operation requires the use of
the multiple brush in place of the standard card brush.
To avoid unnecessary wear on both the brush and the
cards, the multiple brush should be used only when
zero-elimination is of value.
Zero-elimination is made operative for numerical
sorting by cross wiring the lower punching hubs of the
field or fields and, in turn, connecting them to the zero
selector hub as shown in Figure 46. Columns may be
skipped in the right
to
left sequence by leaving them
unwired as shown. At the start of the operation, the
brush selection switch in the units position of the
columns being sorted is set
to SORT,
All other brush
selection switches to the left of the units position are
set
to
SELECT,
even though some columns are skipped
in the right to left sequence. As sorting proceeds for
the 10's, 100's position etc., the brush selection switches
for those positions are successively turned to
SORT
in
order to advance the units reference point for deter-
mining which cards need no further sorting. Each
switch to the left, set to the sort position, takes pre-
cedence over those
to
the right. The zero elimination
operational control switches are turned on, while the
multiple column selection switch is turned off.
to
SORT.
3
2
of switches to
the right of the units
position is immaterial.
I
~
6 6
~N~ P~CH~G
6
}
COMMON FOR NUMERIC
6 {6
SC
~
6
V~~C~NG
6 6
0
9
8
7
6
SELECTOR
1
12
0 0 0 0 0 0 0 0 0
n
Zero-Eliminate Control Switches
ON
Multiple Column Selection Switch
OFf.
Figure 46. Control Panel Wirine - Zero Elimination
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