DUNCAN, W. J., Some Devices for the Solution of Large Sets of Simultaneous Linear Equations, _London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science_, vol. 35, series 7, 1944, pp. 660-670. FRAME, J. SUTHERLAND, Machines for Solving Algebraic Equations, _Mathematical Tables and Other Aids to Computation_, vol. 1, no. 9, Jan. 1945, pp. 337-353. HART, H. C., and IRVEN TRAVIS, Mechanical Solution of Algebraic Equations, _Journal of the Franklin Institute_, vol. 225, Jan. 1938, pp. 63-72. HERR, D. L., and R. S. GRAHAM, An Electrical Algebraic Equation Solver, _Review of Scientific Instruments_, vol. 9, Oct. 1938, pp. 310-315. MALLOCK, R. R. M., An Electrical Calculating Machine, _Proceedings of the Royal Society_, series A, vol. 140, 1933, pp. 457-483. MERCNER, R. O., The Mechanism of the Isograph, _Bell Laboratories Record_, vol. 16, no. 4, Dec. 1937, pp. 135-140. STIBITZ, GEORGE R., Electric Root-finder, _Mathematical Tables and Other Aids to Computation_, vol. 3, no. 24, Oct. 1948, pp. 328-329. WILBUR, J. B., The Mechanical Solution of Simultaneous Equations, _Journal of the Franklin Institute_, vol. 222, Dec. 1936, pp. 715-724. ANALOGUE MACHINES—MISCELLANEOUS Some articles referring to various other kinds of analogue machines and their applications are here listed together: BUSH, V., F. D. GAGE, and R. R. STEWART, A Continuous Integraph, _Journal of the Franklin Institute_, vol. 203, 1927, pp. 63-84. GRAY, T. S., A Photo-Electric Integraph, _Journal of the Franklin Institute_, vol. 212, 1931, pp. 77-102. HAZEN, H. L., G. S. BROWN, and W. R. HEDEMAN, The Cinema Integraph: A Machine for Evaluating a Parametric Product Integral (two parts and appendix), _Journal of the Franklin Institute_, vol. 230, July 1940, pp. 19-44, and Aug. 1940, pp. 183-205. MCCANN, G. D., and H. E. CRINER, Mechanical Problems Solved Electrically, _Westinghouse Engineer_, vol. 6, no. 2, March 1946, pp. 49-56. MYERS, D. M., An Integraph for the Solution of Differential Equations of the Second-Order, _Journal of Scientific Instruments_, vol. 16, 1939, pp. 209-222. PEKERIS, C. L., and W. T. WHITE, Differentiation with the Cinema Integraph, _Journal of the Franklin Institute_, vol. 234, July 1942, pp. 17-29. SMITH, C. E., and E. L. GOVE, An Electromechanical Calculator for Directional-Antenna Patterns, _Transactions of the American Institute of Electrical Engineers_, vol. 62, 1943, pp. 78-82. YAVNE, R. O., High Accuracy Contour Cams, _Product Engineering_, vol. 19, part 2, Aug. 1948, 3 pp.