WW2 BRITISH UN OPENED UNDULATOR INK JUG FROM CODE- BREAKER BLETCHLEY PARK

WW 2 ..Un-opened jug of UNDULATOR INK......  used for extracting the cipher text with an undulator ,based at Knockholt code name FISH , the messages could not be received on a standard teleprinter because of the encryption process. Instead, the output of the radio receiver was fed into an undulator, a high speed recorder. The undulator was a pen recorder which produced a continuous ink trace of the signal on a narrow paper tape called ‘slip’. The tape was read by slip readers who had to memorise the five unit telegraph code and translate the signal trace into letters of the alphabet.
 Bletchley Park  tells the incredible story of the interception and decryption of German High Command radio teleprinter messages during World War Two where the entire wartime code-breaking process from intercept to decrypt originated.Very RARE item. Local buyer pays R100 POSTNET

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