The Newmanry History

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The original Tunny machine was simply a functional reproduction of the

(i) as a decoding machine improvements were effected and gadgets added for

(ii) as an aid to Newmanry setting and breaking, much more versatile models

There were several versions of each, some of the early ones being very

A weakness common to all Tunnies is that the five impulses of each letter of

The tape is fed into an auto-transmitter: chi, psi, unless cut out, are

Each wheel has two rows or jacks, in which shorting plugs can be inserted.

The "display" shows not the wheel settings but the number of positions

Switches K P B ( for X2oneback , P5twoback , PSI1'oneback,) one or more

The characters of PSI1'oneback , P5twoback , P5oneback , which are just

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