cubefan

The BOMBE was a development of the Polish Bomba, the BOMBE did NOT decode Enigma messages, it was an electomechanical device [albeit a very clever one] which helped the code breakers to eliminate the majority of the settings of Enigma which were incorrect.  Hundreds of BOMBEs were built to provide a means of testing possible solutions concurrently, each BOMBE was the equivalent of 26 three wheel Enigma machines, but IT ONLY LOOKED for possible settings.

Reading and decoding Enigma was done either by hand, or later, having deduced the Enigma network settings using the BOMBE and other methods, using a modified British encryption machine.

BTW Turing did not actually make a BOMBE,  he designed some of the internal workings, refined by others, the first ones were made by the British Tabulating Machine company, in Letchworth, Hertfordshire, which later became part of International Computers Limited [ICL], which is now part of Fujitsu.