its diameter. A distribution mechanism could then use the diameter information and take the appropriate action to deal the card to the correct player. Together with the lottery machines, the shuffling devices continued to evolve. In 1934, Ralph Potter invented an electromechanical machine that would read perforated cards and generates random sequences. The data would be then used to power up lamps on the gaming table. These lights symbolized cards and roulette values. Players pressed on buttons to indicate their choices to the machine. To some extent, his device was one of the first attempts to make a computerized pseudo-random generator and game console. During the rest of the 1930s, many inventions tried to address the dealing problem, mainly by using rotating frames that would distribute cards to each player around the table. Rotating parts were common in the shuffling machines; designers often used gears and plates with notches or holes whose purposes were similar to the sequence-generator plate of Hammond's machine. These shufflers shared some similarities with the machines used in cryptography such as Enigma. This German encryption device used during World War II contained rotors that stepped each time a key was typed and produced an encrypted version of the letter. Both domains must fulfill mathematical requirements regarding randomness to avoid known patterns, repeated sequences and other kind of statistical weaknesses or biases. After World War II After World War II, engineers tried to generate random sequences using electrical devices. Signals from electrical noise sources (like a hot cathode gas discharge tube or a resistor) would typically be sent through filters and amplifiers to output one or several random streams. Such a device is described in a 1940 patent by Newby et al.. Most patented machines continued to be based on old mechanical designs that did not provide as much randomness as noise sources, but were more practical. According to the patents filed during the 1950s and 1960s, designers created simple devices where a basic shuffling operation was repeated several times (by feeding the output deck back into the machine) instead of having one complex pass implying many tricky mechanical operations ending up with a poor shuffling and lower reliability. Some of them tried to reproduce what was manually done during riffle shuffling with cards interleaving each others. Card-picking rollers in contact with the top or bottom of the deck were still heavily used at that time. Computerized