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Hagelin C-36
Pin-and-lug cipher machine - wanted item

The C-36 is one of the first mechanical pin-and-lug machines developed by Boris Hagelin around 1936. It is significantly larger than its predecessor, the C-35, and resembles the shape of the later M-209 somewhat. In this model the lugs on the metal bars of the cage are not yet movable.

Like the C-35 it has five pin-wheels albeit with a slightly different distribution of the lugs. The wheels have 17, 19, 21, 23 and 25 pins that can be configured by the user, giving a maximum cipher period of 3,900,225 [1].

The image on the right shows the interior of a C-36A that was donated to Crypto Museum in Februari 2009 [2]. It was used by the Dutch Navy in the 1930s and was supplied by Koopman & Co in Amsterdam, the same company that would later supply the C-446 to the Dutch Navy and Air Force. The machine shown here is incomplete.
  
C-36 interior

A later version of the C-36, designated C-362, was an improved version of the machine. The machine contained a number of changes, but the most imported difference was the fact that the lugs had been made movable, like in the later C-38/M-209, making it more secure. This brings the C-362 closer to the M-209, whilst the C-36 is closer to the design of the earlier C-35.

As with all Hagelin cipher machines, the C-36 came in a number of different versions. In many cases they were modified to the customer's specifications. The C-36 shown on Wikipedia [1] is significantly different from the one featured here. The following differences have been observed:

  • Green case (military) or red exterior with black interior (Navy)
  • Standard (Yale-type) lock or cross-type lock.
  • Crank or knob operated
C-36A (closed) front view C-36A closed Front view of the C-36A Koopman & Co shield on the side of the C-36A C-36A (open) Interior of the C-36A Printer mechanics C-36 interior

Help required
From the machine featured on this page, a number of components are missing. The unit was probably used as 'donor' for spare parts. In the old days it was rather common to 'canibalize' a machine in order to repair several others. Nevertheless, the cage, the pin-wheels and the rest of the mechanics are in good condition, making it a worthwhile restoration project.

We are currently looking for the following parts:
  • Gearbox between crank and main cage axle, plus its cover.
  • Counter with cogwheel.
  • Inner lock with key.
  • Bottom part of the outer lock.
This photograph shows the right hand side of the C-36. As you can see, the crank is present but the mechanics to move the drum are missing. These have probably been removed by a former owner in an attempt to repair the unit.
  
Missing crank gear

The most important parts that we need at the moment are the crank gear (on the right) and the counter with its cog-wheel. If you have any spare parts for this machine, please contact us. Your help is much appreciated. It would be nice to bring this beautiful machine back to life one day.

The 5 pin-wheels of the C-36 The cage of the C-36 Collapsing the crank handle Main body of the C-36A (note the missing counter) Missing crank gear Missing crank gear Printer (note that the counter is missing) Missing inner lock

References
  1. Wikipedia, C-36 (cipher machine)
    Retrieved May 2012.

  2. Remmelt Warries, donator of the C-36A featured on this page
    Crypto Museum, February 2012.
Further information
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Crypto Museum. Last changed: Friday, 10 July 2015 - 07:12 CET.
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