IBM 1130 User Manual page 592

Section
Subsections Page
75 20
I
20
01
Sorting Offline
Sorting offline can be either a manual or a mecha-
nized procedure. A manual procedure (by hand)
should not be used unless volumes are very small.
Even with small volumes, you will need a program
to sequence-check the sorted cards.
A mechanized procedure involves the use of a
sorter. IBM has mechanical sorters available that
can process up to 2000 cards per minute.
The rule-of-thumb procedure for timing offline
mechanized sorts is:
1. Compute the card-passing time for each
column in the control key.
2. Sum these times.
3. Add 10% for card handling.
You must decide whether the time and money spent
sorting offline will be less than the cost of pro-
gramming and running a sort for your 1130.