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Let B C A (Fig. I.) be an Isoscelles Triangle right angled at C. with the Center C, and distance CB, describe the Quadrant B F A; on B A, as a Diameter, describe a Semicircle B K A; the Space comprehended between the Quadrantal are B F A, and the Semicircumference B K A, is call'dHippocrates's Lunula .

philosophical transactions of the royal society of london

III. The dimension of the solids generated by the conversion of Hipppocrates's Lunula, and of its parts about several axes, with the surfaces generated by that conversion, by Ab. De Moivre, F. R. S