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Enigma C
Glow lamp Enigma machine · 1925 - under construction

Enigma C, was an electro­mechanical rotor-based cipher machine, introduced in mid-1925 by Chiffriermaschinen Aktiengesellschaft (ChiMaAG) in Berlin (Germany). Like its predecessors, the Enigma A and Enigma B, it used light bulbs for its output, and was therefore known as a Glüh­lampen­chiffrier­maschine (glow lamp cipher machine). It was succeeded in 1926 by Enigma D.

Enigma C is very similar to the Enigma B Mark II, and has the common layout of the control panel, with the keyboard at the front, the lamp panel just behind it, and the rotors towards the back.

Like on Enigma B, the keyboard is not arranged as on a regular typewriter, but in the order of the alphabet. It would be the last Enigma machine with this layout. Several versions of the Enigma C are known to have existed, including a variant with 28 contact points (rather than 26), and one with 29 keys of which the 'X' was passed through unencrypted. It was known as Funkschlüssel C.
  
Enigma C with serial number A-150. Taken from original ChiMaAG images.

The image above shows one of the few surviving pictures of the standard Enigma C [3], as it was probably used by
ChiMaAG
for the operating instructions. It shows that the keyboard is divided over three height levels (like a staircase) and that the top cover is held in place by four knurled bolts (numbered 12 in the photograph, A in the drawing below). The machine was supplied in an oak-wood box, with a hinged top lid, a lock at the front and a leather grip at the left. It is the first machine with a power switch at the top, allowing selection between the internal 4.5V dry battery and an external 4V source, that can be connected to the two black screw terminals at the right.

Enigma C with serial number A-150. Taken from original ChiMaAG images [6]. Enigma C with serial number A-150. Taken from original ChiMaAG images [6]. Enigma C with serial number A-150. Taken from original ChiMaAG images [6]. Original image of Funkschlüssel C (low-resolution)
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Enigma C with serial number A-150. Taken from original ChiMaAG images [6].
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Enigma C with serial number A-150. Taken from original ChiMaAG images [6].
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Enigma C with serial number A-150. Taken from original ChiMaAG images [6].
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Original image of Funkschlüssel C (low-resolution)

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© Crypto Museum. Created: Sunday 13 September 2009. Last changed: Tuesday, 05 February 2019 - 16:55 CET.
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