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Previous network-computing devices with their uses and limitations are reviewed briefly, following which is a statement of the requisites for an effective a-c. calculating table. The M. I. T. Network Analyzer, a static miniature a-c. power system, designed and constructed jointly by the Massachusetts Institute of Technology and the General Electric Company for the computation of actual power networks, is described in detail and its operation outlined. The fields of its application are enumerated and include the study of normal operating conditions, stability, and short circuits. An example illustrating its application to the solution of a normal-operation problem is given.