This printing is done by simple monoalphabetic substitution with variants,
plugged up on the Garbo electromatic typewriter. There are now only k entries
in depth in the cells of the tally sheet, instead of 5k entries as in the
earlier method. The entries show the number of crosses. These are converted
into excess of dots over crosses, and written in diagonally on a rectangle
sheet as desired.
Mrs. MILES: Models I and II are each made up of 5 Western Union
tape readers and two reperforators and two banks of Siemens high speed non-
chatter relays. Each will combine up to five tapes in any manner not requiring
arrangement of
memory, and punch out results in any \ levels on one or two tapes Each sums,
transfers, etc. Mrs. Miles III has approximately 70 vacuum tubes instead
of relays, to do the summing job with less trouble. The distributors
in the tape readers however give trouble to the vacuum tube counters,
since the distributor brushes have a tendency to bounce, so Mrs Miles IV(under
construction)
will have a vacuum tube ring as distributor. Mrs. Miles makes up tapes for
crib runs. Also she prepares tapes for Garbo rectangling. For this the Z tape is
placed into 5 readers simultaneously as follows:
ROBINSON: The original machine has one "bedstead"(a large rack with wheels)
which holds two tapes and photocell apparatus; 1 counter rack, and 1 control
rack. The bedstead has sprocket drive for the two tapes to keep them in
perfect step, since they both run at once. (as they do NOT do in Colossus.)
Robinson has two counters: one operates while the other prints out.
The controls available are: a. Set-total keys. b.Impulse comparison jacks and plugs.
c. Counter jacks and plugs. Delta process is done by means of two sets of