ANONYMOUS, ENIAC: at the University of Pennsylvania, _Time_, vol. 47, Feb. 25, 1946, p. 90. ANONYMOUS, It Thinks with Electrons; the ENIAC, _Popular Mechanics_, vol. 85, June 1946, p. 139. ANONYMOUS, Electronic Calculator: ENIAC, _Scientific American_, vol. 174, June 1946, p. 248. BELL LABORATORIES RELAY COMPUTERS As yet no full-scale scientific report is available on the Bell Laboratories general-purpose relay computers that went to Aberdeen and Langley Field. However, there is some information about these and other Bell Laboratories relay computing machines in the following articles: ALT, FRANZ L., A Bell Telephone Laboratories’ Computing Machine (two parts), _Mathematical Tables and Other Aids to Computation_, vol. 3, no. 21, Jan. 1948, pp. 1-13, and vol. 3, no. 22, Apr. 1948, pp. 69-84. CESAREO, O., The Relay Interpolator, _Bell Laboratories Record_, vol. 24, no. 12, Dec. 1946, pp. 457-460. JULEY, JOSEPH, The Ballistic Computer, _Bell Laboratories Record_, vol. 25, no. 1, Jan. 1947, pp. 5-9. WILLIAMS, SAMUEL B., A Relay Computer for General Application, _Bell Laboratories Record_, vol. 25, no. 2, Feb. 1947, pp. 49-54. WILLIAMS, SAMUEL B., Bell Telephone Laboratories’ Relay Computing System, _Proceedings of a Symposium on Large-Scale Digital Calculating Machinery_, Harvard University Press, 1948, pp. 40-68. ANONYMOUS, Complex Computer Demonstrated, _Bell Laboratories Record_, vol. 19, no. 2, Oct. 1940, pp. v-vi. ANONYMOUS, _Computer Mark 22 Mod. 0: Development and Description_, Navord Report No. 178-45, Washington, D. C.: Navy Department, Dec. 6, 1945, 225 pp. ANONYMOUS, Relay Computer for the Army, _Bell Laboratories Record_, vol. 26, no. 5, May 1948, pp. 208-209. THE KALIN-BURKHART LOGICAL-TRUTH CALCULATOR As yet there are no published references on the Kalin-Burkhart Logical-Truth Calculator. Some books covering a good deal of mathematical logic are: QUINE, W. V., _Mathematical Logic_, New York: W. W. Norton & Co., 1940, 348 pp. REICHENBACH, HANS, _Elements of Symbolic Logic_, New York: The Macmillan Co., 1947, 444 pp. TARSKI, ALFRED, _Introduction to Logic_, New York: Oxford University Press, 1941, 239 pp. WOODGER, J. H., _The Axiomatic Method in Biology_, Cambridge, England: The University Press, 1937, 174 pp. Chapter 2, pp. 18-52, is an excellent and understandable summary of the concepts of mathematical logic. Several papers on the application of mathematical logic to the analysis of practical situations are: