ECKERT, W. J., Facilities of the Watson Scientific Computing Laboratory, _Proceedings of the Research Forum_, International Business Machines Corporation, 1946, pp. 75-80. THE DIFFERENTIAL ANALYZER The basic scientific articles on the two differential analyzers at Massachusetts Institute of Technology are: BUSH, VANNEVAR, The Differential Analyzer: A New Machine for Solving Differential Equations, _Journal of the Franklin Institute_, vol. 212, no. 4, Oct. 1931, pp. 447-488. BUSH, VANNEVAR, and SAMUEL H. CALDWELL, A New Type of Differential Analyzer, _Journal of the Franklin Institute_, vol. 240, no. 4, Oct. 1945, pp. 255-326. Some of the less technical articles about the second differential analyzer at M.I.T. are: CALDWELL, SAMUEL H., Educated Machinery, _Technology Review_, vol. 48, no. 1, Nov. 1945, pp. 31-34. GENET, N., 100-Ton Brain at M.I.T., _Scholastic_, vol. 48, Feb. 4, 1946, p. 36. ANONYMOUS, Mathematical Machine; New Electronic Differential Analyzer, _Science News Letter_, vol. 48, Nov. 10, 1945, p. 291. ANONYMOUS, Robot Einstein: Differential Analyzer at M.I.T., _Newsweek_, vol. 26, Nov. 12, 1945, p. 93. ANONYMOUS, M.I.T.’s 100-Ton Mathematical Brain is Now to Tackle Problems of Peace, _Popular Science_, vol. 148, Jan. 1946, p. 81. ANONYMOUS, The Great Electro-Mechanical Brain; M.I.T.’s Differential Analyzer, _Life_, vol. 20, Jan. 14, 1946, pp. 73-74 ... ANONYMOUS, All the Answers at Your Fingertips; in the Laboratory of M.I.T., _Popular Mechanics_, vol. 85, Mar. 1946, pp. 164-167 ... A differential analyzer was built at the Moore School of Electrical Engineering: TRAVIS, IRVEN, Differential Analyzer Eliminates Brain Fag, _Machine Design_, July 1935, pp. 15-18. A differential analyzer was built at the General Electric Company, Schenectady, N. Y. Instead of using a mechanical or electrical amplifier of the motion of the little turning wheel riding on the disc, this machine follows the motion using polarized light. This machine is described in: BERRY, T. M., Polarized Light Servo System, _Transactions of the American Institute of Electrical Engineers_, vol. 63, Apr. 1944, pp. 195-197. KUEHNI, H. P., and H. A. PETERSON, A New Differential Analyzer, _Transactions of the American Institute of Electrical Engineers_, vol. 63, May 1944, pp. 221-227. A differential analyzer has been put into use at the University of California: BOELTER, L. M. K., and others, _The Differential Analyzer of the University of California_, Los Angeles: University of California, 1947, 25 pp.