Excerpt from The Elementary Theory of Direct Current Dynamo Electric Machinery
The authors of this little book believe that in the training of an Electrical Engineer there should be included a knowledge of the theory of the subject built up logically from first principles, each step being illustrated with the help of some piece of machinery or practical appliance of a general and simple rather than an elaborate or necessarily up-to-date type; and that he should be taught not to accept statements without evidence of their truth. If he follows this plan he will be able to understand any piece of electrical machinery which he comes across, not because he has ever seen or heard of it before, but because he can recognise it is a particular case of a general class whose fundamental principles he has mastered. If on the other hand he attempts to learn one by one all the various commercial machines and appliances on the market at the moment, his task will be unending. The creation of new types is unceasing, but the principles are permanent.
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