The Special Fish Report
Albert W. Small (December 1944)
Codes and Ciphers
TOP SECRET Special Fish Report Page 105
Description of Machines Used in "Newmanry"
TUNNY: Newman's section has three tunny machines: the first two
use standard telephone relays (type P.0. 3,000) to generate the chi and psi and
motor patterns. The third and latest model uses telephone relays and will
perform the delta operation in addition.
Each Tunny is primarily used for deciphering messages; it is also
used for de-chi-ing; it can work backwards as well as forwards. Each Tunny
has available 2 reperforators, 1 teletypewriter printer, and 1 tape
On model three, any tape can be sent through and a delta tape
generated; or wheel patterns my be delta-ed. The control panels and
pattern generators are on relay racks with total width of 8 feet, and
height of eight feet. The tape transmitter, reperforators, and typewriter are
on a desk nearby. Any impulse can be included or excluded.
JUNIOR: (Three available.) Consists of 1 reader, 1 electromatic
typewriter, 1 plugboard. Used to print de-chis.
GARBO: Used primarily to make rectangles. Model I can make delta-de-
chi tapes or prints, although models II and III do not have memory apparatus needed
for delta Garbo consists of 2 I.B.M. tape readers, 1 I.B.M. regenerating typewriter,
and 1 perforator; the assembly is on two tables and there is a small rack for
switches. In Garbo I the memory relays are arranged in 4 small banks on the
switch rack. Delta process can be done by using two tapes, one tape plus memory,
and in case of delta-de-chi, by one tape for Z text, memory, and one delta-X tape.
Results can be printed on typewriter or punched on tape. Garbo can transfer
impulses to different levels, etc. Any letter on the tape may be made to
operate any letter on the electromatic typewriter.