The Newmanry History

53E Page 336

Any wheel can be stepped i.e. its setting increased at each revolution of

This will not of course be confused with the ordinary motion of the wheels

Each wheel has two 3-way switches in the control panel, one in the upper

Either of these two switches may be thrown up or down.

Upper switch up ) causes the wheel to step fast
or Upper switch down ) i.e. to step at each tape
or Lower switch down ) revolution.

Lower switch up - causes the wheel to step slowly i.e. to step only

When all wheels return to their original settings (strictly to the plug in

Any pattern, except a "special pattern" is available deltaed either on the Q

The conventional Tunny delta is the sum of present and future i.e. forwards.

This is immaterial provided that all patterns in use are deltaed by Colossus

For example suppose that Z is a plain Z tape which is being deltaed by
Colossus and added to delta X set up deltaed on the X trigger, the two patterns
being level so that the recorded setting is 01.

Opposite the second sprocket hole Colossus produces for delta Z: 1st character
+ 2nd character.

Opposite the second sprocket hole delta X is plugged as: 2nd character + 3rd
character.

It follows that the true setting of X is 02.


This is in many cases corrected by adjusting the settings, whence the phrase

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