Introductory Acoustics George Walter Stewart

ISBN: 9781406720167

Published: March 1st 2007

Paperback

216 pages


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Introductory Acoustics  by  George Walter Stewart

Introductory Acoustics by George Walter Stewart
March 1st 2007 | Paperback | PDF, EPUB, FB2, DjVu, talking book, mp3, RTF | 216 pages | ISBN: 9781406720167 | 7.27 Mb

Introductory Acoustics BY GEORGE WALTER STEWART, PH. D., Sc. D. Hon. Professor of Physics in the University of Iowa FOURTH IRIXTIXG NEW YORK D. VAN NOSTRAND COMPANY, IMC. 250 FOURTH AVENUE Copyright, 1932, 1933, by D. VAN NOSTRAND COMPANY, INC. AllMoreIntroductory Acoustics BY GEORGE WALTER STEWART, PH. D., Sc. D. Hon. Professor of Physics in the University of Iowa FOURTH IRIXTIXG NEW YORK D.

VAN NOSTRAND COMPANY, IMC. 250 FOURTH AVENUE Copyright, 1932, 1933, by D. VAN NOSTRAND COMPANY, INC. All Rights Reserved This book, or any parts thereof, may not be reproduced in any form without written permission from the publishers. Special Edition, March 1932 Reynfar Edition Published, February 1933 Reprinted, February 1937, November 1940 June 1946 PRINTED IN THE U. S. A. PREFACE The accompanying text is an elementary treatise that under takes to consider the most comjpon phenomena in acoustics. The content assumes no previdtfs preparation in physics, and utilizes very few mathematical expressions.

The limitation in preparation of the student is met by the insertion in the text of the meaning of each technical term at the point where it is first employed. The absence of mathematics places an increased responsibility upon language in presenting a clear analysis of all the phenomena. Thus at many points the writing is necessarily condensed a ffd requires careful reading and re-reading.

If the student will arf ticipate this type of effort he will have no serious difficulty. The text does not survey the field rapidly as most elementary texts do it endeavors to study each topic with a thoroughness some what unexpected in a nonmathematical text. The student will secure an acquaintance that will not only serve as a background for any professional work involving acoustics, but also as valu able information that can be applied with success. As a matter of fact, the viewpoint of the book is utility in the broadest sense, including culture.

Thehistorical aspects of the subject are largely omitted to make room for the detailed explanations and analyses which are regarded as more important. The number of students who need such a background and yet who cannot afford the time for mathematical studies is rap idly increasing.

While these have been prominently in the authors mind, yet it is evident that the book can also be used in intermediate courses in physics. Moreover, the amount of acoustics in the usual elementary course in physics is so small that students with and without previous preparation in elemen tary physics can use this text in the same class.

But it is pref erable that the course be offered in the junior and senior years rather than in the first year of college. vi PREFACE Numerous demonstration experiments are suggested through out. These and others which can be introduced by the instructor will prove invaluable.

The preparation of this text has extended over several years in connection with classes consisting for the most part of students specializing in music, speech and psychology. The attitude they have shown toward acquiring a clear understanding of acoustics and the pleasure they have derived from the nonmathematical analyses of phenomena have supplied the incentive for the revi sions and final preparation of the manuscript.

I take pleasure in acknowledging my indebtedness to the students who have from time to time given excellent criticism and especially to my colleagues, Dr. P. G. Clapp, Director of Music, who prepared Section 14.6, and Dr. C. J. Lapp, who has critically examined the entire manuscript.

GEORGE WALTER STEWART CONTENTS CHAPTER I SOUND WAVES PAGE .1 Acoustics I .2 Waves 3 .3 Properties ofWaves 4 .4 A Wave in a Helix 7 .5 Different Aspects of a Wave 8 .6 Gas as a Medium for Sound Waves 10 .7 Representation of a Sound Wave 10 .

8 Velocity 15 U A Variation of Velocity 1 8 i. io Frequency and Wave-Length 20 l i i Dopplers Principle 10 1 2 Velocity of the Particle of the Medium 21 Questions 21 CHAPTER II REFLECTION AND ABSORPTION IN AUDITORIUMS 2. i Reflection at a Plane Surface 23 2.2 Echo 25 2.3 Reverberation . 4.4 Absorption . 2.5 Reverberation in a Room 27 2.6 Modern Absorbing MaterialsS T 30 2.7 Absorption Coefficients . . . T 32 2...



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