The IBM Selective-Sequence Electronic Calculator The IBM Selective-Sequence Electronic Calculator was finished and announced in January 1948, and is alluded to briefly at the end of Chapter 10. More information about this machine is in the following references: ECKERT, W. J., Electrons and Computation, _The Scientific Monthly_, vol. 67, no. 5, Nov. 1948, pp. 315-323. INTERNATIONAL BUSINESS MACHINES CORPORATION, _IBM Selective-Sequence Electronic Calculator_, New York: International Business Machines Corporation (form no. 52-3927-0), 1948, 16 pp. The Raytheon Computer The Raytheon Computer is a machine under construction at the Raytheon Manufacturing Co., Waltham, Mass. BLOCH, R. M., R. V. D. CAMPBELL, and M. ELLIS, The Logical Design of the Raytheon Computer, _Mathematical Tables and Other Aids to Computation_, vol. 3, no. 24, Oct. 1948, pp. 286-295. BLOCH, R. M., R. V. D. CAMPBELL, and M. ELLIS, General Design Considerations for the Raytheon Computer, _Mathematical Tables and Other Aids to Computation_, vol. 3, no. 24, Oct. 1948, pp. 317-323. A “System of Electric Remote-Control Accounting” During the 1930’s a system using connected punch-card machinery was experimented with in a department store in Pittsburgh. The purpose of the system was automatic accounting and analysis of sales. This system is described in: WOODRUFF, L. F., A System of Electric Remote-Control Accounting, _Transactions of the American Institute of Electrical Engineers_, vol. 57, Feb. 1938, pp. 78-87. The Univac The Univac is a machine under construction at the Eckert-Mauchly Computer Corporation, Philadelphia. A similar but smaller digital computer called the Binac is also being developed. ECKERT-MAUCHLY COMPUTER CORPORATION, _The Univac System_, Philadelphia: Eckert-Mauchly Computer Corp., 1948, 8 pp. ELECTRONIC CONTROL CO. (now ECKERT-MAUCHLY COMPUTER CORP.), _A Tentative Instruction Code for a Statistical Edvac_, Philadelphia: Electronic Control Co. (now Eckert-Mauchly Computer Corp.), May 7, 1947, 19 pp. SNYDER, FRANCES E., and HUBERT M. LIVINGSTON, Coding of a Laplace Boundary Value Problem for the UNIVAC, _Mathematical Tables and Other Aids to Computation_, vol. 3, no. 25, Jan. 1949, pp. 341-350. The Zuse Computer The Zuse Computer is a small digital computer constructed in Germany. LYNDON, ROGER C., The Zuse Computer, _Mathematical Tables and Other Aids to Computation_, vol. 2, no. 20, Oct. 1947, pp. 355-359. THE DESIGN OF DIGITAL MACHINES Following are a number of references on various aspects of the design of digital computing machines: Organization