Elementary Electricity (Classic Reprint)

Excerpt from Elementary Electricity

AN attempt has been made in this book to represent the subject of electricity in a logical manner, and to keep in View its present-day aspect as well as its history. Magnetism is no longer treated as a separate subject, as modern theory holds that magnetism is an attribute of electricity in motion, that is, of the electric current. As an introduction to the subject one of the most familiar applications of electricity is Chosen - the electric incandescent lamp, and from this the rest is developed. Those branches of magnetism which stand apart from the main thread of the treatment of electricity, namely, terrestrial magnetism and the magnetic properties of materials, are relegated to the two last chapters. One of the most difficult conceptions for the student, that of potential, is introduced in the treatment of electricity at rest, that is, electrostatics, as it is here a simple quantity. Its relation to the rate of working in the case of a current then follows easily.

While fitted for classes of students studying electricity with an examination in view, the book is also intended to give them a wide outlook upon the subject in its present state of development. For this reason chapters on electric waves and wireless telegraphy and telephony, electrons and X-rays and radioactivity are added; in fact there is a tendency in modern examinations to introduce these subjects to a small extent in order to make electricity a living rather than a historical subject. Only well-established facts have been included, but these prepare the way for the intensely interesting subject of the modern theories of the constitution of matter which the student may follow later.

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