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Download e-book for iPad: Amateur Telescope Making Vol 3 by Albert G. Ingalls

By Albert G. Ingalls

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Begin with a word, as God did, Augustine urges the reader: “You spoke and things were made. ” The year is 397. Augustine is forty-three, midway through his life as an overwhelmed bishop in Hippo, a North African port city of the fallen Roman Empire. He has written dozens of books—collections of sermons, scholarly rebukes of his theological foes—and now undertakes The Confessions, a strange and riveting work that will take four years to complete. In the first nine of its thirteen chapters, Augustine recounts the key details of his life from infancy (as best he can infer) to his formal embrace of Christianity, in 386, and his mother’s death the following year.

First, Arias’s team in Paris gathers all the necessary ingredients: the nanosecond-scale differences between each member clock and every other one, plus a strong dash of local data about the historical behavior of each clock. The information is then run through what Arias called “the algorithm,” which takes into account the number of clocks in service (on any given day some clocks may be down for repair or recalibration), gives slight statistical favor to the more accurate of these clocks, and whisks the whole to a uniform texture.

It was a mathematical subdivision, defined by relation: one-sixtieth of a minute, one thirty-six-hundredth of an hour, one eighty-six-thousand-four-hundredth of a day. Seconds pendulums appeared on some German clocks in the fifteenth century. But it wasn’t until 1670, when the British clockmaker William Clement added a seconds pendulum, with its familiar tick-tock, to Huygens’s pendulum clock, that the second acquired a reliably physical, or at least audible, form. The second fully arrived in the twentieth century, with the rise of the quartz clock.

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Amateur Telescope Making Vol 3 by Albert G. Ingalls

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