IBM 80 Customer Engineering Manual page 59

MULTIPLE COLUMN SELECTION DEVICE
THE MULTIPLE cohunn selection device may be in-
stalled on a Type 75, 80 or 82 Sorter and can be used
for either multiple column selection or zero elimina-
tion. This device has no effect upon machine speed.
Externally the device consists of a demountable ten-
position brush which permits reading from any ten
adjacent card columns in one pass of the card through
the reading station. In addition, the machine is ex-
ternally equipped with a small control panel, ten
switches for the selection of brushes for sorting, and
the necessary operational control switches. On a Type
82 machine there are three operational control switches;
two zero·eliminate switches which are connected by a
common bar and operate together, and one multiple
column selection switch. On Type 75 and 80 machines
there are two operational control switches; one zero·
eliminate switch and one select switch.
On a Type 82 machine, the operational control
switches are mounted directly below rhe start and stop
keys in a special recess in the right upper front cover
assembly. The control panel and brush selection
switches are mounted on a special cover plate on the
right end of the machine as shown in Figure 43. A
holder is provided on this cover plate to accommodate
the ten·position brush holder and cable assembly when
it is not in use. The plastic cover over the control panel
and brush assembly operates a microswitch to open
the main machine circuit when this cover is raised. In
addition, there is a contact in the brush holder assembly
which is open at any time the brush holder is not
mounted in its reading position or is not properly
mounted on its holder near the control panel. This
brush holder contact also opens the main machine
cir-
cuit, thus protecting the operator from shock while
handling the brush assembly.
Figure 43. Multiple Column Selection Device, Type 82
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