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Temperature variations are secondary in comparison to humidity. If the tape is
stored at about 70°F, no departure from the specified width should be observed.
6.0 "Tape Handling."
2 .4
CAPACITY AND SPEED
It is possible to write information in any of seven tracks across the face of the
tape. Each track is independent of every other track and is associated with one read-
write coil.
Looking at the top of the tape, the tracks appear similar to Figure 1.
The tape is fed through the machine at a speed of 75 in ch es/sec. and the bits are
written approximately every 67. 2 usee.
written in one inch of space.
20, 000 80-column cards.
Information may be placed on the tape in any configuration of bits desired.
configuration and interpretation is under control of the external circuitry to which the
tape is attached.
The distance required to start and stop the tape motion must be mentioned when
considering capacity.
The combined distance required to stop and restart the tape
motion is about 3 /4 inch.
not moving fast enough to allow accurate writing or reading of bits.
number of stops necessary during writing greatly affects the amount of space avail
able for writing information.
This means that about 200 bits may be
One 2400-foot reel can contain the information on about
Nothing may be written in this space because the tape is
9
See
The
Therefore, the
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