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Excerpt from College Physics, Vol. 2: Electricity and MagnetismIn order to explain attraction as well as repulsion, it was necessary to assume the existence of two different kinds of magnetism of opposite nature, positive and negative. Magnet ism was also assumed to be an imponderable substance, since the magnetization of a piece of iron or steel did not change its weight. We shall see later that this theory is unsatisfactory, and that the phe...

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Excerpt from College PhysicsIn pursuance of the first of these purposes, that arrangement of topics has been chosen which, in the experience of the authors, has been found to lend itself most readily to a simple and natural presentation of the subject as a whole. Owing to the more obvious relations existing between them, the sub jcet of heat is made to follow immediately after the distinctly material phenomena of mechanics and sound, electrici...

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Originally published in 1913. PREFACE: This text is offered to teachers of elementary physics with the hope that it will not only prove to be teachable in method, but also that it may possess that "human touch" which will make it interesting to read as well as profitable to study. This early works is a comprehensive and informative look at the subject with much of the information still useful and practical today. Many of the earliest books, pa...