Brearley, Harry Chase, 1870-, Ingersoll, Robt. H., & Bro · New York, Pub. by Doubleday, Page & Co. for Robert H. Ingersol & Bros. · leaf 100
e Pope Sylvester II, was the one who first tookthe important step of producing a real clock, and that thisoccurred near the close of the tenth century—or to bemore exact, about 990 A. D. This period was one of densestsuperstition, and expectancy of the end of the world was inthe air, since many… … Galileo Discovering the Principle of the Pendulum As a youth of seventeen Galileo watched a swinging lamp, in the Cathedral of Pisa, timed it by his pulse, and discovered the principle iip07i which pendulum clocks are built. Time Telling Through the Ages 605, :i bull of Pope Sabinianus decreed that…
Time measurements · Clocks and watches
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