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Craig Sawyers · 2nd Dec 2018, 11:39 am

The four rotor caused a few problems with the Bombe design at Bletchley. They had to add a fourth rotor bank geared to drive ten times faster to break the four rotor in the same time as the break time for the three rotor.

2nd Dec 2018, 11:39 am	#29
Craig Sawyers Dekatron Join Date: Nov 2010 Location: Oxford, UK. Posts: 4,980	Re: ENIGMA machine being auctioned. The four rotor caused a few problems with the Bombe design at Bletchley. They had to add a fourth rotor bank geared to drive ten times faster to break the four rotor in the same time as the break time for the three rotor.