Excerpt from Continuous Current Machine Design
In attempting to find at a reasonable price, and between one pair of covers, a text-book for the more advanced student of Continuous Current Machine Design, I have met with perpetual difficulty. It seems to me that the text-books hitherto published fall naturally into two groups - those which cost too much, and those which are too special. The former have grown up with the subject, and in process of time successive editions and additions have brought them to a state reminding one of the fifth age of man. To these standard works all students are indebted; though few can afford to buy them: they are indeed often regarded as luxuries to be found in reference libraries only. Books of the second class are usually written to cover special ground at a special time, to act as vade mecum to a i particular examination, or to render temporary assistance to the expert.
In the present volume I have tried to avoid these extremes by omitting all that a student may reasonably be expected to know i at the end of his second year, and by indicating the road along i which designers have hitherto travelled and the direction in which ft the next move is likely to be made. It is my hope that the book may be a useful companion to the student, both in the drawing office and in the class-room, as well as a stimulating and suggestive guide to the teacher. In recent design the introduction of the "commutating pole" or "interpole" has been responsible for a great many changes; and these account for the large proportion of this volume devoted to temperature rise. Yet, lest a change in the price of copper should some day abolish the interpoles, machines not dependent upon them are also fully considered.
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