Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 316
f, all similar second marks were in an absolute straight line, andthat with a fine drawing pen and a straight edge a line could be drawnaccurately bisecting each second mark; in other words, its secondaryrate was not a tenth of a second in two hours. As the principle ofHuygens Parabolic Pendulum… … Let A A be a vertical axis of rotationwhich can be driven by clock^vork acting atthe top or the bottom of the axis ; from thisaxis a pendulum P is suspended in such a•way that when it hangs vertically the string Slies wrapped over a curved surface E, whichforms part and parcel of the vertical…
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