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 ...