![]() ![]() Once released, the fan spun until the spring ran down and released the pay levers. It is perhaps ironic that the oldest mechanical slot machines from the 1930s through the early ‘60s had a True RNG, otherwise known as a “fan clock.” This was a spring-driven spinning blade, hand-bent and full of holes, that was wound by a player pulling the handle. Those folks in Washington don’t share a lot, but the speculation is that they derive randomness from listening to the variances of background radio waves from space, or they measure the rate of decay or other quantum factors associated with radioactive materials. If you’re the NSA, you might want to choose a better physical phenomenon than a dice roll. Bennett, “Randomness,” Harvard University Press
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