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Published August 1949 | Published
Journal Article Open

Electronic Techniques Applied to Analogue Methods of Computation


This paper describes in detail the electronic devices and principles that have been developed for the California Institute of Technology (CIT) electric analogue computer. This is a general-purpose, large-scale computer applicable to a wide range of linear and nonlinear ordinary algebraic or differential equations and linear and nonlinear partial differential equations. In addition to the basic principles of the computer, a detailed discussion is given of those elements considered to be of particular interest. These include the devices for generating the arbitrary functions of the independent variable (the excitation functions), the amplifiers for producing active linear elements such as negative impedances and for representing the nonsymmetrical terms of the matrix specifying the differential equations, the multipliers for producing arbitrary functions of the dependent variables (nonlinear elements). Performance data on these devices are presented, together with analogies and solutions of representative types of problems.

Additional Information

© 1949 IEEE. Original manuscript received by the Institute, October 8, 1948; revised manuscript received, February 24, 1949. Presented, 1948 IRE West Coast Convention, Los Angeles, Calif., September 30, 1948. Part of the development research on the electronic components of this computer was carried out under a Frederick Gardner Cottrell Research Grant of the Research Corporation. This grant covered research on the multipliers and arbitrary function of the dependent variable. The authors also wish to acknowledge the assistance of R. H. MacNeal and Werner Buchholz, who worked on this project under the Cottrell Research Grant.

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August 19, 2023
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