Elements of Mechanism PETER SCHWAMB, S. B. Professor of Machine
Design Retired, Massachusetts Institute of Technology ALLYNE L.
MERRILL, S. B. Professor of Mechanism, Massachusetts Institute of
Technology WALTER H. JAMES, S. B. Associate Professor in the
Department of Mechanical Engineering, Massachusetts Institute of
Technology THIRD EDITION, REWRITTEN, ENLARGED, AND RESET TOTAL
ISSUE FORTY-EIGHT THOUSAND NEW YORK JOHN WILEY SONS, INC. LONDON
CHAPMAN HALL, LIMITED COPYKIQHT, 1904, 1905, BY PETER SCHWAMB AND
ALLYNE L. MERRILL COPYRIGHT, 1921, BY PETER SCHWAMB ALLYNE L.
MERRILL WALTER H. JAMES Printed in U. S. A. PREFACE TO THE THIRD
EDITION This revised edition embodies many changes suggested by
instructors who have used the second edition during the last
sixteen years. The authors-acknowledge their indebtedness to all of
these gentlemen, and especially to Prof. George W. Swett, who has
read a large part of the manuscript and given much valuable
criticism. Professor Walter H. James, in charge of the instruction
in Mechanical Engineering Drawing and Machine Drawing at the
Massachusetts Institute of Technology, and also an Instructor in
Mechanism for many years, has been in charge of the revision, and
joins in the authorship of the book. PETER SCHWAMB. ALLYNE L.
MERRILL. WALTER H. JAMES. CAMBRIDGE, MASS., December, 1920 PREFACE
TO SECOND EDITION The main subject-matter of this work was written
during 1885 by Peter Schwamb and has been used since then, in the
form of printed notes, at the Massachusetts Institute of
Technology, as a basis for instruction in mechanism, being followed
by a study of the mechanism of machine tools and of cotton
machinery. The notes were written because asuitable text-book could
not be found which would enable the required instruction to be
given in the time available. They have accomplished the desired
result, and numerous inquiries have been received for copies from
various institutions and individuals desiring to use them as
text-books. This outside demand, coupled with a desire to revise
the notes, making such changes and additions as experience has
proved advisable, is the reason for publishing at this time. Very
little claim is made as to originality of the subject-matter which
has been so fully covered by previous writers. Such available
matter has been used as appeared best to accomplish the object
desired. Claim for consideration rests largely on the manner of
presenting the subject, which we have endeavored to make
systematic, clear, and practical. Among the works consulted and to
which we are indebted for sug gestions and illustrations are the
following Kinematics of Machinery, and Der Konstrukteur, by F.
Reuleaux, the former for the discussion of linkages, and the latter
for various illustrations of mechanisms Principles of Mechanism, by
S. W. Robinson, for the discus sion of non-circular wheels
Kinematics, by C. W. MacCord, for the discussion of annular wheels
and screw-gearing Machinery and Millwork, by Rankine Elements of
Mechanism, by T. M. Goodeve and Elements of Machine Design, by W.
C. Unwin. PETER SCHWAMB. ALLYNE L. MERRILL. October 20, 1904
CONTENTS PAQB CHAPTER I INTRODUCTION 1 CHAPTER II REVOLVING AND
OSCILLATING BODIES 12 CHAPTER III BELT, ROPES AND CHAINS 21 CHAPTER
IV TRANSMISSION OF MOTION BY BODIES IN PURE ROLLING CONTACT 63
CHAPTER V GEARS AND GKAR TEETH 86 CHAPTER VI WHEELS IN TRAINS 153
CHAPTER VIIEPICYCLIC GEAR TRAINS 166 CHAPTER VI11 INCLINED PLANE,
WEDGE, SCREW, WORM AND WHEEL 180 CHAPTER IX CAMS 197 CHAPTER X
FOUR-BAR LINKAGE. RELATIVE VELOCITIES OF RIGIDLY CONNECTED POINTS
221 CHAPTER XI LlNKWORK 244 CHAPTER XII STRAIGHT-LINE MECHANISMS
PARALLEL MOTIONS 291 CHAPTER XIII MISCELLANEOUS MECHANISMS
AGGREGATE COMBINATIONS PULLEY BLOCKS INTERMITTENT MOTION 306
PROBLEMS 336 INDEX 367 vii Elements of Mechanism CHAPTER I
INTRODUCTION 1...
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