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Enigma C
The first lamp-based Enigma - wanted item

The Enigma C was the first Enigma machine that used light bulbs (German: Glühlampen) for its output. It was introduced in 1924 and was much smaller, and therefore more portable, than the printing Enigma (German: Schreibende Enigma), Enigma A, that was introduced a year earlier. It was also far more affordable: with a price of RM 1000 it was 1/8th of the price of the Enigma A.
 
Several versions of the Enigma C were built. The basic model had 26 contact points on the cipher wheels and used the standard international alphabet. The keys on the keyboard were placed in the order of the alphabet (ABCDEF...) rather than in the more common QWERTZ order.

A special version was built for the German Navy (Kriegsmarine). It was called Funk Schlüssel C and had 28 contact points on each cipher wheel. The keyboard however, had 29 keys, of which the letter X was wired 'straight through'. The UKW was fixed in this version (could not be set), but could be mounted in 4 different orientations.
  
Courtesy FRA Sweden

The image above shows a Swedish version of the Enigma C. This image, and the images below, were taken at the Enigma Reunion 2009 at Bletchley Park, where the FRA [1] showed this rare Enigma C from their own private collection and allowed us to make some photographs of it.

This version of the Enigma C was built for the Swedisch government [1]. Like Funkschlüssel C it had 28 contacts on each cipher wheel, but it had just 28 keys on the keyboard. A special alphabet was used in which the Swedish letters Å, Ä and were added and the letter W was omitted (replaced by VV). It had a fixed reflector (UKW) that could be mounted in 2 different orientations.

The wiring of this machine is currently unknown.
 
Swedish version of the Enigma C (check the keyboard) Swedish version of the Enigma C Close-up of the rotors and part of the lamp panel Close-up of the lock and some keys

 
References
  1. Försvarets Radioanstalt (FRA), Enigma C
    Swedish National Defence Radio Establishment.

Further information

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Crypto Museum. Last changed: Friday, 15 May 2015 - 22:22 CET.
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