Modern Physics by Charles Dull Hard Cover 1949 601 Pages

Modern Physics by Charles Dull Hard Cover 1949 601 Pages

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Modern Physics by Charles Dull Hard Cover 1949 601 Pages
Modern Physics by Charles Dull Hard Cover 1949 601 Pages  Some minor damage around the bottom edge of the cover, the bidning edge is looses from the binding.  
ELEMENTARY PHYSICS IS more closely related to Our daily life than most other high school subjects. From the time you open the water faucet in the morning until you snap off the electric lamp on retiring, you are constantly applying or observing some principle of physics. These principles may be connected with automobiles, airplanes, television, or nuclear energy; they may have to do with more common articles like wheelbarrows, bucksaws, or garden tools; or they may be related to football, baseball, or some other sport. A study of physics will enable you better to understand and to control your environment.
In writing this textbook, the authors have practiced the following method of approach:
1. The topic is stated or a question is raised.
2. Some incident with which the pupil is familiar is used as an introduction.
3. The physical principle is then discussed or explained in language simple enough for a beginner to understand.
The manner in which the principle is utilized is shown by the use of one or more applications.
Such a method arouses interest by its inductive approach; its simplicity makes it easy to understand; it links the principle with the pupil's former experiences; it is practical because it introduces so many appliances used every day.
Many of the illustrations in this text are line drawings. These have been used abundantly because generally they teach better than photographs. It would be difficult to teach the operation of a gasoline engine, a steam engine, or a dynamo from photographs. But a line drawing, which emphasizes the important details, gets the point across readily. The drawings in this edition have been critically reviewed, and brought up to date in the light of new knowledge and changing conditions. Many photographs have also been used. They give the student an excellent idea of the size and variety of the machines which are applications of physical principles. Those depicting the newest developments in industry and engineering have been selected.
Many word illustrations are used, too. They make the book much more readable, and serve to emphasize the fact that physics is a science which is rich in human interest. Many historical references are included for the same reason; otherwise, the pupil might get the idea that physics just mushroomed overnight. In several cases, the effect of the study of physics on economic conditions is pointed out. Possibly the development of this science was one of the most important factors in the Industrial Revolution. Physics also has an important bearing on various safety factors.
The authors define density as the weight per unit volume, because they believe that a beginner is confused when he is asked to go into the laboratory, weigh an object, and then record its mass. The use of the term "specific weight" is continued because it, too, probably has more meaning to a beginner than the term "specific gravity."
The time is more than ripe for a change of electrical-wiring diagrams to conform to the electron-flow theory. A Congress of Physicists should doubtless meet and agree to make such a change. Until they do, it would cause much confusion for the authors of one book to make such a change,  particularly in schools where several different books are in use. In the meantime, we shall follow Franklin. Wherever practical, however, in the preparation of this edition, the electrical-wiring diagrams indicate the direction of electron flow, as well as the conventional indication of current flow.
In writing this book the authors have constantly tried to keep in mind the pupil's point of view. The language is simple, and the explanations are full enough to enable pupils to understand those topics which sometimes appear difficult. The book has all the material needed to meet the College Entrance Examination Board requirements. It can be used, also, with non-college groups in differentiated courses.
Some topics are starred to indicate that they may be omitted. The final selection is left to the instructor, who will find it easier to omit certain topics than to add new material.
Among the aids to pupils are the word illustrations and picture illustrations which have already been mentioned. In addition, previews give the pupil a glimpse of each unit. These previews have been completely rewritten to reveal the sweep of progress in each of the various fields of physics. At the beginning of each chapter, the pupil will find a glossary of new terms. Every new type of mathematical problem is explained. In addition to the explanation, one problem is solved for the pupil. This not only insures a more complete understanding of mathematical physics, but it also illustrates an analytical approach to problem solving. Formulas are included for the benefit of those who prefer to use the formula method. A complete list of all formulas is given in Appendix A.
The summaries, found at the end of each chapter, are useful for emphasis and for review. And the questions, which also appear at the conclusion of each chapter are thought-provoking. They stress the many ways in which physics plays a part in the pupil's daily life. They also serve to test his ability to apply physical principles. More mathematical problems are included than any one pupil is expected to solve. The problems are graded so the instructor can adapt them to groups of different ability. The average pupil should be able to solve all the problems in Group A. The problems in Group B are intended for the superior pupil, or they may be used for extra credit. Both the questions and the problems have been completely rewritten. Problems on transformers and on electroplating have been included. Several new problems utilizing trigonometric functions have been included under Forces and under Index of Refraction for those classes with a wider mathematical background. Appendix B contains tables of essential data needed by the pupil for elementary physics. These tables have been checked for accuracy, and corrected in all cases where more recent data were available. A. Table of Electrochemical Equivalents has been added.

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