The Newmanry History

Part of the General Report on Tunny (1945)

Page 369

Tony Sale's
Codes and Ciphers

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56F Page 369

56E. GARBO. Fig 58(xxi).

Everything said about Junior applies to Garbo : the only difference is
that, in addition, Garbo has a row of switches for Delta'ing. Garbo always
Delta's backwards.

1. If the switch labelled Sum Delta is thrown to Delta-d , each letter is
differenced; it may thereafter be steckered.

2. If the same switch is thrown to Sum Delta , and some Delta-Z switches are
thrown the corresponding impulses are differenced and added, being printed as . or
X : no steckering is needed.

"Clear" merely clears any letter left from the preceding run.

"punch" is thrown if the output is connected to a punch instead of a
typewriter.

56F. MILES.

(a) Function.

A Miles is a machine which when fed with one or more tapes produces a tape
combining them in some way.

(b) The early Miles.

The early Miles could combine tapes by adding them (in the Tunny sense).
Impulses could not be permuted, though an impulse could be cut out. No further
description is given.

(c) Miles B.C.D.

These are a development of the early Miles. With no plugging and switches
all normal the tapes are merely added. By plugging impulses can be permuted.
Differencing is not possible except by using two tapes at a stagger of one.
(Details : 56G)

(d) The Mechanical flag Gadget (Miles D).

This introduced an extension of the notion of combining tapes, viz that one
tape can be used to control the stepping of another, or of itself. (Details
56G(m)).

(e) Miles A.

This was designed to be as flexible as possible : nothing is transferred
from input to output without being plugged. Plugging is therefore usually more
extensive than on Miles B,C,D; but because it is based on a simple uniform
principle (56H (c)), it is very easy and can be made quickly.

Differencing, up to eight times, is provided by means of memory circuits.
(Details 56H).

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