The Making of Pennsylvania An Analysis of the Elements of the Population And Th
The Making of Pennsylvania An Analysis of the Elements of the Population And Th
Fisher Sydney George
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But the . Important thing to notice about these men was, that they I were entirely devoted to original research and discovery, . And cared for past knowledge only as it contributed to f progress. i The man who ranked next to Franklin in Pennsylvania I science was David Rittenhouse. On his father's side he : traced his ancestry to Hohand, but his mother was a Welshwoman. He was a mathematical genius, invented 217 The Making of Pennsylvania the metallic thermometer, developed the construction of ...the compensation pendulum, and made valuable experi- ments on the compressibility of water. But the most prominent act of his life was the part he took in observing the transit of Venus in 1769. Up to that time this interesting phenomenon of such rare oc- currence, and so important to astronomers, had never been carefully observed, and accuracy in it had become more necessary than ever, because, as had been pointed out, it would afford the best data for calculating the dimensions of the solar system.
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