A Textbook of the Principles of Physics is a comprehensive survey of the fundamental principles of physics, including mechanics, heat, thermodynamics, waves, and electricity. The book is intended for use as a textbook in university-level courses on physics, as well as for self-study. The author provides clear explanations of the concepts and equations involved, and includes numerous problems and examples to illustrate how the principles are used in real-life situations. This book is an essential resource for anyone interested in the principles that govern the physical world. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.