How to make a motor or dynamo

An electric motor is capable of appearing in as many different forms as a steam engine. To decide just what form is best adapted for amateurs and other experimenters is difficult to state. As soon as the builder starts, he must decide between a drum or a ring armature, high or low speed, bipolar or multipolar fields, salient or consequent poles; wrought or cast-iron field magnets, iron clad or other forms of magnetic circuits. The armature may be placed at the top, middle or bottom of the machine. If the constructor were to look in technical papers and books to decide which form to adopt, he would find himself in hopeless perplexity.
(Typographical errors above are due to OCR software and don't occur in the book.)

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