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The recent advent of computer time-sharing systems with teletypewriter input and output has made rapid interaction between the computer and its users practical, thereby providing a way to overcome many of the disadvantages previously encountered in attempts to automate the design of power transformers through the use of batch-processed programs (card deck input). A time-sharing program has been developed specifically to utilize the engineering judgement and experience of the designer in making certain design decisions that are not easily programable, while relieving him of the tedious and time consuming computation required for hand calculated designs. The time needed to compete the calculations for a typical transformer design has been reduced to about one hour, compared to from one to several days by hand calculations or batch-processed computer programs. The organization and capabilities of the program are described, and examples of its use are indicated.