Elementary Fluid Mechanics

ELEMENTARY FLUID MECHANICS BY JOHN K. VENNARD Assistant Professor of Fluid Mechanics New York University NEW YORK JOHN WILEY SONS, INC. LONDON CHAPMAN HALL, LIMITED 1940 COPYRIGHT, 1940, BY JOHN K. VENNARD All Rights Reserved This book or any part thereof must not be reproduced in any form without the written permission of the publisher. PRINTED IN U. S. A. PRESS OP BRAONWORTH A CO.. INC. BRIDGEPORT. CONN. ELEMENTARY FLUID MECHANICS PREFACE Fluid mechanics is the study under all possible conditions of rest and motion. Its approaches analytical, rational, and mathematical rather than empirical it concerns itself with those basic principles which lead to the solution of numerous diversified problems, and it seeks results which are widely applicable to similar fluid situations and not limited to isolated special cases. Fluid mechanics recognizes no arbitrary boundaries between fields of engineering knowledge but attempts to solve all fluid problems, irrespective of their occurrence or of the characteristics of the fluids involved. This textbook is intended primarily for the beginner who knows the principles of mathematics and mechanics but has had no previous experience with fluid phenomena. The abilities of the average beginner and the tremendous scope of fluid mechanics appear to be in conflict, and the former obviously determine limits beyond which it is not feasible to go these practical limits represent the boundaries of the subject which I have chosen to call elementary fluid mechanics. The apparent conflict between scope of subject and beginner f s ability is only along mathematical lines, however, and the physical ideas of fluid mechanics are well within the reach of the beginner in the field. Holding to the belief that physical concepts are the sine qua non of mechanics, I have sacrificed mathematical rigor and detail in developing physical pictures and in many cases have stated general laws only without numerous exceptions and limitations in order to convey basic ideas such oversimplification is necessary in introducing a new subject to the beginner. Like other courses in mechanics, fluid mechanics must include disciplinary features as well as factual information the beginner must follow theoretical developments, develop imagination in visualizing physical phenomena, and be forced to think his way through problems of theory and application. The text attempts to attain these objectives in the following ways omission of subsidiary conclusions is designed to encourage the student to come to some conclusions by himself application of bare principles to specific problems should develop ingenuity illustrative problems are included to assist in overcoming numerical difficulties and many numerical problems for vi PREFACE the student to solve are intended not only to develop ingenuity but to show practical applications as well. Presentation of the subject begins with a discussion of fundamentals, physical properties and fluid statics. Frictionless flow is then discussed to bring out the applications of the principles of conservation of mass and energy, and of impulse-momentum law, to fluid motion. The principles of similarity and dimensional analysis are next taken up so that these principles may be used as tools in later developments. Frictional processes are discussed in a semi-quantitative fashion, and the text proceeds to pipe and open-channel flow. A chapter is devoted to the principles and apparatus for fluid measurements, and the text ends with an elementary treatment of flow about immersed objects...

Science & Math

Vennard, John K.

Physics

Angell Press

Violin Varnish

VIOLIN VARNISH A Plausible Re-creation of the Varnish Used by the Italian Violin Makers Between the Years 1550 and 1750, A. D. By JOSEPH MICHELMAN Published by JOSEPH MICHELMAN, Cincinnati, Ohio, U. S. A. 1946 Introduction PUBLICATION OF THIS BOOK is approached with a little temerity. After more than eight years of extensive research on the varnish used by the Italian Violin Makers from 1550 to 1750 A. D., it has not been possible to corroborate the results in the chemical laboratory. This is due entirely to the unavailability of samples of the varnish for confirmatory analysis. Violins made by the Italian masters of this period are so valuable and so scarce that a small sample of the varnish has not been procurable for experi mental purposes. Therefore, synthesis must precede analysis .... and with no assistance from the latter. This, then, will explain the sub-title of this book as A Plausible Re-creation of the Varnish Used by the Italian Makers Between the Years 1550 and 1750 A. D. However, the results of this investigation are so logical and so deeply supported by a vast amount of convincing evidence, that publication of the book is in order. First, possibly the find ings will be confirmed, or otherwise, by investigators who may be more fortunate in having access to material from authentic violins made by the old masters. Confirmatory chemical tests will be suggested it should be comparatively simple, especially through modern micro-analytical methods, to determine the presence of certain constituents in the varnish. Secondly, possibly the results will be suggestive to others so that the confirmed rediscovery of the so-called lost art of var nishing violins will eventually ensue. It is unfortunate that this policy of freely exchanging ideas and information has not gen erally existed. Almost every violin-maker has his own private formulas for varnishes, which he treasures highly and guards closely. The secret of the old Italian masters has defied dis covery for nearly one hundred years, and any disclosures that will shed light on the mystery should be made. vi VIOLIN VARNISH Thirdly, the results may be interesting from a chemical stand point the literature investigated does not contain many refer ences to similarly colored vaniishes. The varnishes are perfectly transparent and many are exceedingly permanent, which may be of interest to paint and varnish chemists. Investigators in the realm of colloid chemistry may be interested in the organosols that will be discussed. If the results of this investigation are eventually confirmed, then it must follow that the varnish makers of medieval times produced Synthesized their own resins. The synthetic resin would then become a product of the 16th cen tury and not belong exclusively to more recent years as hereto fore pre-supposed. Lastly, and most important of all, publication of these results should make freely and permanently accessible to violinists, and lovers of the instrument throughout the world, violins that satisfy the criteria that have been established for the instruments cellos and basses included of the old Italian makers. . . . The instru ments of these masters are now two hundred to four hundred years old. Their violins are made entirely of wood held to gether only with glue and cannot be expected to withstand the ravages of time forever. . . . Then too, better instruments should be made more universally available to violinists students as well as amateurs and professional players. Deserving playere are too frequently deprived of the advantages of good quality instru ments and are compelled to use ill-sounding, unresponsive violins with a resulting decrease in interest and advancement. Further improvement in the quality of modern violins is desired, and that improvement should approach the standards established by the old Italian masters. The subject matter of this book will of necessity become tech nical, especially when the theoretical aspects are considered...

Crafts, Hobbies & Home

Michelman, Joseph

Antiques & Collectibles

VIOLIN VARNISH A Plausible Re-creation of the Varnish Used by the Italian Violin Makers Between the Years 1550 and 1750, A. D. Author: JOSEPH MICHELMAN Originally published in 1946. Introduction: PUBLICATION OF THIS BOOK is approached with a little temerity. After more than eight years of extensive research on the varnish used by the Italian Violin Makers from 1550 to 1750 A. D., it has not been possible to corroborate the results in the chemical laboratory. This is due entirely to the unavailability of samples of the varnish for confirmatory analysis. Violins made by the Italian masters of this period are so valuable and so scarce that a small sample of the varnish has not been procurable for experimental purposes. Therefore, synthesis must precede analysis .... and with no assistance from the latter. This, then, will explain the sub-title of this book as A Plausible Re-creation of the Varnish Used by the Italian Makers Between the Years 1550 and 1750 A. D. However, the results of this investigation are so logical and so deeply supported by a vast amount of convincing evidence, that publication of the book is in order. First, possibly the find ings will be confirmed, or otherwise, by investigators who may be more fortunate in having access to material from authentic violins made by the old masters. Confirmatory chemical tests will be suggested it should be comparatively simple, especially through modern micro-analytical methods, to determine the presence of certain constituents in the varnish. Secondly, possibly the results will be suggestive to others so that the confirmed re-discovery of the so-called lost art of varnishing violins will eventually ensue. It is unfortunate that this policy of freely exchanging ideas and information has not generally existed. Almost every violin-maker has his own private formulas for varnishes, which he treasures highly and guards closely. The secret of the old Italian masters has defied discovery for nearly one hundred years, and any disclosures that will shed light on the mystery should be made. Thirdly, the results may be interesting from a chemical stand point the literature investigated does not contain many refer ences to similarly colored vaniishes. The varnishes are perfectly transparent and many are exceedingly permanent, which may be of interest to paint and varnish chemists. Investigators in the realm of colloid chemistry may be interested in the organosols that will be discussed. If the results of this investigation are eventually confirmed, then it must follow that the varnish makers of medieval times produced Synthesized their own resins. The synthetic resin would then become a product of the 16th century and not belong exclusively to more recent years as therefore pre-supposed. Lastly, and most important of all, publication of these results should make freely and permanently accessible to violinists, and lovers of the instrument throughout the world, violins that satisfy the criteria that have been established for the instruments cellos and basses included of the old Italian makers. . . . The instruments of these masters are now two hundred to four hundred years old. Their violins are made entirely of wood held to gether only with glue and cannot be expected to withstand the ravages of time forever. . . . Then too, better instruments should be made more universally available to violinists students as well as amateurs and professional players. Deserving playere are too frequently deprived of the advantages of good quality instru ments and are compelled to use ill-sounding, unresponsive violins with a resulting decrease in interest and advancement. Further improvement in the quality of modern violins is desired, and that improvement should approach the standards established by the old Italian masters. The subject matter of this book will of necessity become tech nical, especially when the theoretical aspects are considered...

Explorations and Adventures in Equatorial Africa

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Explorations And Adventures In Equatorial Africa

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Mathematics

This volume contains a simple guide to kitchen gardening, showing how to prepare and lay out the ground, and explaining the best means of cultivating a vast array of vegetables and herbs. Complete with clear and concise instruction, and profusely illustrated, this text will be of considerable value to the novice, and constitutes a wonderful addition to collections of gardening and culinary literature. The chapters of this book include: 'Situation', 'Exposure', 'Aspect', 'Extent', 'Shelter', 'Shade', 'Soil', 'Water', 'Water Appliances', 'Form', 'Walls', 'Cultivation and Management', 'Ridging', 'Trenching', 'Manure', 'Rotation of Crops', 'Pricking Out', 'Thinning Out', 'Weeds', 'Watering', 'Gathering', 'Refuge', and much more. This book was first published in 1879, and is being proudly republished now complete with a new introduction on gardening.

Kitchen Gardening Made Easy - Showing How to Prepare and Lay out the Ground - The Best Means of Cultivating Every Known Vegetable and Herb - With ... the Management of Them all the Year Round.

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