In Scientific American: "Designed nearly 150 years ago but never actually built until recently,
the Difference Engine No. 2 designed by Charles Babbage (1791 to 1871)
is a piece of Victorian technology meant to tussle with logarithms and
trigonometry long before the first modern computer. Technophiles have a
rare opportunity beginning May 10 to see one of these devices (only two
exist) on display at the Computer History Museum in Mountain View, Calif."
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