General Report on Tunny

11B Page 5

The WT Receiver was independent of both trucks but carried by them when the unit was not operating.

When in operation Sendungswagen and Receiver were usually placed about ½ mile from the Betriebswagen and connected to it by cable. On occasions when the teleprinters were connected by land line, the Betriebswagen was connected up directly to an exchange board.

At the Berlin end of Fish links and in some other fairly firmly established places (e.g. Paris in 1943), equipment was not arranged on a mobile basis but in a central station or exchange.

Three types of Fish machines are known:
STURGEON (used mainly by the German Air force)
TUNNY (used mainly by the German Army) which forms the subject of this report.
THRASHER (Which is dealt with in ch 93)

11B     THE TUNNY CIPHER MACHINE.

(a) Addition.

Fig. 11 (I) THE ADDITION SQUARE

  / 9 H T 0 M N 3 R C V G L P I 4 A U Q W 5 8 K J D F X B Z Y S E
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  / 9 H T 0 M N 3 R C V G L P I 4 A U Q W 5 8 K J D F X B Z Y S E


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