ANONYMOUS, Electrical Gun Director Demonstrated, _Bell Laboratories Record_, vol. 22, no. 4, Dec. 1943, pp. 157-167. ANONYMOUS, Development of the Electric Director, _Bell Laboratories Record_, vol. 22, no. 5, Jan. 1944, pp. 225-230. ANONYMOUS, Old Field Fortune Teller: Electronic Oil Pool Analyzer, _Popular Mechanics_, vol. 86, Sept. 1946, p. 154. HARVARD IBM AUTOMATIC SEQUENCE-CONTROLLED CALCULATOR The basic scientific description of this machine as of September 1, 1945, is contained in: AIKEN, HOWARD H., and STAFF OF THE COMPUTATION LABORATORY, _A Manual of Operation for the Automatic Sequence-Controlled Calculator_, Cambridge, Mass.: Harvard University Press, 1946, 561 pp. The machine has changed rather a good deal since Sept. 1, 1945. Some circuits have been removed. Other circuits have been added. The capacity of the machine to do problems has been greatly increased. The Computation Laboratory at Harvard University is cordial towards scientific inquiries, and some unpublished, mimeographed information is available at the laboratory regarding the details of these changes. Some shorter scientific and technical descriptions of the machine are contained in: AIKEN, HOWARD H., and GRACE M. HOPPER, The Automatic Sequence Controlled Calculator (3 parts), _Electrical Engineering_, vol. 65, nos. 8, 9, and 10, Aug. to Nov. 1946, p. 384 ... (21 pp.). BLOCH, RICHARD M., Mark I Calculator, _Proceedings of a Symposium on Large-Scale Digital Calculating Machinery_, Harvard University Press, 1948, pp. 23-30. HARRISON, JOSEPH O., JR., The Preparation of Problems for the Mark I Calculator, _Proceedings of a Symposium on Large-Scale Digital Calculating Machinery_, Harvard University Press, 1948, pp. 208-210. INTERNATIONAL BUSINESS MACHINES CORPORATION, _IBM Automatic Sequence-Controlled Calculator_, Endicott, N. Y.: International Business Machines Corporation, 1945, 6 pp. Some of the less technical articles regarding the machine are: GENET, N., Got a Problem? Harvard’s Amazing New Mathematical Robot, _Scholastic_, vol. 45, Sept. 18, 1944, p. 35. TORREY, V., Robot Mathematician Knows All the Answers, _Popular Science_, vol. 145, Oct. 1944, pp. 86-89.... ANONYMOUS, Giant New Calculator, _Science News Letter_, vol. 46, Aug. 12, 1944, p. 111. ANONYMOUS, Mathematical Robot Presented to Harvard, _Time_, vol. 44, Aug. 14, 1944, p. 72. ANONYMOUS, World’s Greatest Machine for Automatic Calculation, _Science News Letter_, vol. 46, Aug. 19, 1944, p. 123. ANONYMOUS, Superbrain, _Nation’s Business_, vol. 32, Sept. 1944, p. 8.