Collier's new encyclopedia : a loose-leaf and self-revising reference work ..with 515 illustrations and ninety-six maps . Greek History is a scholarly workwritten in a popular style. His workson Olympia and other ancient cities areaddressed rather to scholars than to thegeneral public. He died July 11, 1896. CURTIUS, MARCUS, a Roman hfiro,who devoted himself to the infernal godsfor the safety of his country. Accordingto the legend, a wide chasm having sud-denly appeared in the Forum, the oracledeclared that it never would close untilRome threw into it its most precious pos-sessions. Thereupon
Collier's new encyclopedia : a loose-leaf and self-revising reference work ..with 515 illustrations and ninety-six maps . Greek History is a scholarly workwritten in a popular style. His workson Olympia and other ancient cities areaddressed rather to scholars than to thegeneral public. He died July 11, 1896. CURTIUS, MARCUS, a Roman hfiro,who devoted himself to the infernal godsfor the safety of his country. Accordingto the legend, a wide chasm having sud-denly appeared in the Forum, the oracledeclared that it never would close untilRome threw into it its most precious pos-sessions. Thereupon Curtius, arminghimself, mounted his horse, and sayingthat Rome contained nothing more pre-cious to its greatness than a valiant citi-zen fully accoutered for battle, he sol-emnly threw himself into the abyss,which instantly closed over his head, B. CURVE, a line by a moving pointwhich continually changes its direction incontradistinction to a straight line. Acurve which lies wholly in a plane iscalled a plane curve or curve oi simplecurvature; but when a curve lies par-tially outside of a plane it is called a. GLENN HAMMOND CURTISS curve of double curvature or a skew, tor-tuous or twisted curve. Ordinary curvescan be defined as geometrical loci, by a CURVE 228 CURZON OF KEDLESTON prescribed kinematic movement of a point1 or a line, according to the methods of an-alytic geometry, by an equation betweenco-ordinates, as the intersection of a planeby an irregular surface. The ellipse forexample can be represented in all fourof these methods: as the geometricallocus of all points for which the sum ofthe distances of two given points—thefoci—is constant. Kinematically by anellipsograph or oval; by an equation ofthe second rank, and by the section of acone by a plane. The consideration of curves as geomet-rical loci is based on the principles of thegeometry of Euclid and is the most an-cient method of studying curves and dis-covering new kinds. Far more fruitfuland speedy i
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921
