The Newmanry History

56L Page 378

(i) Reversing one or more of the five impulses.
(ii) Making blank one or more of the five impulses.
(iii) Running backwards.
(iv) Encoding with P5 limitation.
(v) Innumerable switches for cutting out lamps.

Tunnies "1" and "3" can produce differenced tapes.

Given a cipher text all of whose settings are known, the appropriate

As each letter of cipher is typed out on the keyboard, Chi, Psi, are

In place of the keyboard an auto-transmitter reading a cipher tape can be

The settings of all wheels at each letter are shown by indicating lamps.

For swift operation some switches are on a control box adjacent to the

See 56K(b), but there is no display of positions moved through, only of

See 56K(c).

In early models if it were necessary for any reason, such as typists' error

(i) the "set reading" switch causes the chaser settings to move forward to

(ii) the "reset" switch causes the current settings to move back to the

These switches are duplicated on the control box.

The same lamps are used to indicate both current and chaser settings, but

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