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Scientific American, Vol. 101, No. 1 (July 1909) (1909)

leaf 8

An illustration from Scientific American, Vol. 101, No. 1 (July 1909), 1909, leaf 8
ction of the motions the various means that have been employed in the ap- measuring angles in the early times a device known as of the planets by the astronomers and astrologers of plication of this science to every-day life. From the a cross staff was used, where a movable transverse the middle… … manuscripts, early printed works, an extensive collec- Using the quadrant to measure the altitude.of Qnadrant of Tyrolean workmanship dating from tion of portraits and autographs of prominent mathe- an Inaccessible tower. about 1600. maticians, and curios gathered from many corners of Reproduction…

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