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Electronic computer program development for small power transformers is described. The methods used are applicable to simple open type designs rated up to 3 kw and up to 1000 volts working with primary and secondary taps. Computer operating time averages 2.5 minutes; most of this is the time required for feeding in the rating data and reading the computer output. Design information includes core, turns, turns per layer, wire size, winding height, winding resistances, regulation, secondary terminal voltage, and total of core and coil losses. An example is given to illustrate the procedure and some incidental advantages of computer design are indicated.