[101] J. A. DUERKSEN, _Pendulum Gravity Data in the United States_ (Special Publication No. 244, U.S. Coast and Geodetic Survey; Washington, 1949). [102] Ibid., p. 2. See also, E. J. BROWN, loc. cit. (footnote 85). [103] PAUL R. HEYL and GUY S. COOK, "The Value of Gravity at Washington," _Journal of Research, National Bureau of Standards_ (1936), vol. 17, p. 805. [104] SIR HAROLD JEFFREYS, "The Absolute Value of Gravity," _Monthly Notices of the Royal Astronomical Society, Geophysical Supplement_ (London, 1949), vol. 5, p. 398. [105] J. S. CLARK, "The Acceleration Due to Gravity," _Phil. Trans._ (1939), vol. 238, p. 65. [106] HUGH L. DRYDEN, "A Reexamination of the Potsdam Absolute Determination of Gravity," _Journal of Research, National Bureau of Standards_ (1942), vol. 29, p. 303; and A. BERROTH, "Das Fundamentalsystem der Schwere im Lichte neuer Reversionspendelmessungen," _Bulletin Géodésique_ (1949), no. 12, pp. 183-204. [107] T. C. MENDENHALL, op. cit. (footnote 83), p. 522. [108] A. H. COOK, "Recent Developments in the Absolute Measurement of Gravity," _Bulletin Géodésique_ (June 1, 1957), no. 44, pp. 34-59. [109] See footnote 89. [110] C. S. PEIRCE, "On the Deduction of the Ellipticity of the Earth, from Pendulum Experiments," _Report of the Superintendent of the U.S. Coast and Geodetic Survey for 1880-81_ (Washington, 1883), app. no. 15, pp. 442-456. [111] HEISKANEN and VENING MEINESZ, op. cit. (footnote 95), p. 74. [112] Ibid., p. 76. [113] Ibid., p. 309. [114] Ibid., p. 310. [115] K. REICHENEDER, "Method of the New Measurements at Potsdam by Means of the Reversible Pendulum," _Bulletin Géodésique_ (March 1, 1959), no. 51, p.72. U.S. GOVERNMENT PRINTING OFFICE: 1965 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C., 20402--Price 70 cents. INDEX Airy, G. B., 319, 324, 332 Albrecht, Karl Theodore, 322, 338 Al-Mamun, seventh calif of Bagdad, 306 Almansi, Emilio, 339 Aristotle, 306 Baeyer, J. J., 321, 322, 324, 338, 346 Baily, Francis, 317 Basevi, James Palladio, 345 Berroth, A., 342 Bessel, Friedrich Wilhelm, 313, 314, 319, 320, 324, 325, 338, 346 Biot, Jean Baptiste, 325, 329 Bohnenberger, Johann Gottlieb Friedrich, 315 Borda, J. C., 311, 312, 315, 325, 329, 346 Boscovitch, Père R. J., 310, 311 Bouguer, Pierre, 307, 309, 327, 343, 345 Brahe, Tycho, 306 Brown, E. J., 334, 339 Browne, Henry, 304, 314 Bruhns, C., 322, 324, 338 Brunner Brothers (Paris), 329 Cassini, Giovanni-Domenico, 306, 307 Cassini, Jacques, 306 Cassini de Thury, J. D., 311, 312, 315, 325, 329, 346 Cellérier, Charles, 320, 321, 325, 326, 329, 336 Clairaut, Alexis Claude, 308, 309, 343, 345 Clark, J. S., 342 Clarke, A. R., 345 Colbert, Jean Baptiste, 306 Cook, A. H., 342 Cook, Guy S., 339, 342 Defforges, C., 314, 329, 346