Like card-catalog " method, developed using his " cyclometer, " the Zygalski-sheet procedure was independent of the number of plugboard plug connections in the Enigma machine.
22.
Preparation of this catalog, using the cyclometer, was, said Rejewski, " laborious and took over a year, but when it was ready, obtaining daily keys was a question of [ some fifteen ] minutes ".
23.
Rejewski worked out the wiring in the new reflector, but the catalog of characteristics had to be compiled anew, again using Rejewski's " cyclometer ", which had been built to his specifications by the AVA Radio Company.
24.
A "'cyclocomputer "'or " cyclometer " ( obs . ) is a device mounted on a bicycle that calculates and displays trip information, similar to the instruments in the dashboard of a car.
25.
As part of that effort, the Poles exploited quirks of the rotors, compiled catalogs, built a cyclometer to help make a catalog with 100, 000 entries, built the cryptologic bomb to mechanically search for rotor settings, and made Zygalski sheets.
26.
As her reward, she received a fully nickel-coated Columbia bicycle from the American Bicycle Company, along with an ornate tool storage pouch, a solid silver cyclometer from The Standard Watch Company, and a silver search lamp from the Bridgeport Brass Company.
27.
The grill method would sometimes fail after the Germans increased the number of plugboard connections to ten on 1 January 1939 . When the SD net switched to the new message-key protocol on 1 July 1939, the grill method ( and the cyclometer method ) were no longer useful.
