It is on this word action that the whole question Of mathematics rests: for my Object is simply to render as easy Of comprehension as possible the nel'l'on Of a dynamo, especially with a Drum armature, as well as with a Gramme. To this end anything more than an occasional simple mathematical illustration is not necessary.

It is apprehended that the beginner will read these pages during the early period Of his training, while he is studying his mathematics, and SO may combine the two together at a later and more advanced stage.

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