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I. INTRODUCTION
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To the users of the Kagelin type C Cryptographers, manufactured
since 1936, such as the C-36, ..., C-48,.,... , C-446, and the con
verter M-2Q9, the exterior and the mechanism of the new CX-52
machines will seem familiar, even if the indicating disk has been
replaced by a stationary alphabet ring and a movable index, placed
on the cover for the type wheel assembly. As in the C-machine there
is an indicating knob at the left side of the machine, connected
to two typewheels, which is set by hand for each operation.
This knob is mechanically connected to the movable index, by
which the letter to be ciphered or deciphered is indicated. 3y
pulling a lever at the right side of the machine, the ciphering
or deciphering of each letter is eff e c t e d , a s a s l i d e b a r d r u m ,
co ntrolle d by s ix keywhe els, is the n re volved fo r one compl et e
turn, during which the alphabetwheel unit is displaced a number
of steps. The primary letter is printed immediately before the
displacement begins, the secondary letter is printed after its
comp l e t ion, and t h e t a pe, on wh i c h t he lett e r s a re prin t e d , is
then advanced to receive the following imprints.
Th e descr iptio n aims to g ive a clear e xplan ation o f the
functions and the cryptographical properties of the machines. It
has been found pertinent to make some references to, and comparisons
with the earlier tj?pes. When making such references, type C-446
will be cited; a description of this machine will on request be
supplied to those who are not familiar with it.
Some expressions in the description may sound unfamiliar or
even incorrect to the reader. No internationally approved vocabulary,
pertaining to ciphering machines has however been established, and
the correct usage of some cryptological terms is still disputed.
The purpose of the appended list of definitions is therefore only
to help the reader to understand the meaning of certaiD special
expressions in the following description.
