01196cam a2200253I 450 869567 19860730074855.0 740425 1914 eng u HEI OCL WEL WELS QA95 .B2 Ball, W. W. Rouse (Walter William Rouse), 1850-1925. Mathematical recreations and essays. 6th ed. London, Macmillan, 1914. xvi, 506 p. illus. 20 cm. Arithmetical recreations.--Geometrical recreations.--Mechanical recreations.--Chessboard recreations.--Magic squares.--Unicursal problems.--Kirkman's school-girls problem.--Miscellaneous problems.--The mathematical tripos.--Three classical geometrical problems.--The parallel postulate.--Insolubility of the algebraic quintic.--Mersenne's numbers.--String figures.--Astrology.--Cryptographs and ciphers.--Hyper-space.--Time and its measurement.--Matter and ether theories. Advertising matter: p. 493-506. Includes bibliographical references. Mathematical recreations. Geometry Famous problems. Cryptography. Ciphers. .b14023416