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PRACTICAL

MECHANICAL DRAWING

AND MACHINE DESIGN

SELF TAUGHT

Drafting Tools—Geometrical Definition of Plane Figures—Properties of the Circle—Polygons—Geometrical Definitions of Solids—Geometrical Drawing—Geometrical Problems—Mensuration of Plane Surfaces—Mensuration of Volume and Surface of Solids—The Development of Curves—The Development of Surfaces—The Intersection of Surfaces—Machine Drawing—Technical Definitions—Materials Used in Machine Construction —Shafting—Machine Design—Transmission of Motion by Belts—Horsepower Transmitted by Ropes — Horsepower of Gears — Transmission of Motion by Gears — Diametral Pitch System of Gears—Worm Gearing—Steam Boilers—Steam Engines—Tables

BT

CHAS. WESTINGHOUSE
WITH OVER TWO HUNDRED ILLUSTRATIONS

CHICAGO

FREDERICK J. DRAKE & CO., PUBLISHERS

[graphic]

Copyright, 1906

By Frederick J. Drake & Co.

Chicago

114023

sc

PREFACE

If mechanical drawing is to be of any practical use to a person, he must be able to thoroughly understand the form and arrangement of the various parts of a machine from an inspection of the drawings of the machine without reference to the machine itself. He ought also to be able to make drawings of a machine or the parts of a machine from the machine itself. As mechanical drawing is simply the application of the principles of geometry to the representation of machines, a person who wishes to become thoroughly conversant with mechanical drawing and machine design

should commence by studying the geometrical problems given in this work. The student in following up the problems given, should not content himself by merely copying the drawings, but should do each example over and over, until he is thoroughly familiar with the principles involved in their construction, and also understands why each line is drawn.

In working over these examples several times the student is not only committing them to memory, but is at the same time becoming proficient in the handling of the various drawing tools.

THE AUTHOR.

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