Display showing Polish designed mechanical aids for deciphering Enigma
This is a color image of a display showing three devices developed by the Poles during the late 1930s and during World War II to decrypt the German Enigma machines. The display has black text and black line drawings against a white or tan background. The heading reads "The Mechanical Aids Invented by the Poles". The text below the heading is "The solving of the rotor internal wiring was in itself no mean task and lead the Poles to develop mechanical aids to key finding. Notably the Cyclometer, the Bomba and the Zygalski sheets." The images of the Bomba, Cyclometer, and Zygalski sheets on the display. The Zygalski sheets is a grid pattern with the 26 letter alphabet arranged on both vertical and horizontal columns.