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ENGINEERING

DRAWING AND DESIGN

(A TEXT-BOOK OF).

PART I-PRACTICAL GEOMETRY.

PROFESSOR JAMIESON'S INTRODUCTORY MANUALS. With numerous INustrations and Examination Papers. STEAM AND THE STEAM ENGINE (Elementary Text-Book on). For First-year Students. NINTH EDITION, Revised and Enlarged. 3s. 6d. "Should be in the hands of EVERY engineering apprentice."-Practical Engineer.

MAGNETISM AND ELECTRICITY (Elementary Text-Book

on). For First-year Students. FIFTH EDITION, Revised. 3s. 6d. "A THOROUGHLY TRUSTWORTHY Text-Book."-Nature.

APPLIED MECHANICS (Elementary Text-Book on). Specially arranged for First-year Students. FIFTH EDITION, Revised and Enlarged. 3s 6d. "Nothing is taken for granted. The work has VERY HIGH QUALITIES, which may be condensed into the one word 'CLEAR.'"-Science and Art.

PROFESSOR JAMIESON'S ADVANCED MANUALS.

In Large Crown 8vo. Fully Illustrated.

STEAM AND STEAM ENGINES (A Text-Book on). For the Use of Students preparing for Competitive Examinations. With over 200 Illustrations, Folding Plates, and Examination Papers. THIRTEENTH EDITION, Revised and Enlarged. 8s. 6d.

"Professor Jamieson fascinates the reader by his CLEARNESS OF CONCEPTION AND SIMPLICITY OF EXPRESSION. His treatment recalls the lecturing of Faraday."-Athenæum.

MAGNETISM AND ELECTRICITY (Advanced). Specially arranged for Advanced and "Honours" Students. By Prof. JAMIESON, assisted by DAVID ROBERTSON, Jun., B.Sc. [In preparation. APPLIED MECHANICS (An Advanced Text-Book on). Vol. I. -Comprising the Principle of Work and its Applications; Gearing. THIRD EDITION. 7s. 6d.

"FULLY MAINTAINS the reputation of the Author-more we cannot say." ."-Practical Engineer. Vol. II.-Comprising Motion and Energy; Graphic Statics: Strength of Materials; Hydraulics and Hydraulic Machinery. SECOND EDITION, Revised and Enlarged. 8s. 6d.

"WELL AND LUCIDLY WRITTEN."-Engineer.

By W. J. MACQUORN RANKINE, LL.D., F.R.S., Late Regius Professor of Civil Engineering in the University of Glasgow. Thoroughly Revised by W. J. MILLAR, C.E., late Secretary to the Institute of Engineers and Shipbuilders in Scotland.

I. APPLIED MECHANICS (A IV.
Manual of). The Principles of Statics
and Cinematics, and Theory of Struc-
tures, Mechanism, and Machines. With
numerous Diagrams. SIXTEENTH EDI-
TION. 12s. 6d.

II. CIVI

THE STEAM ENGINE AND OTHER PRIME MOVERS (A Manual of). With numerous Tables and Illustrations, and a Diagram of the Mechanical Properties of Steam. FIFTEENTH EDITION. 12s. 6d.

ENGINEERING (A V. USEFUL RULES AND

TABLES: For Architects, Builders, Engineers, Founders, Mechanics, Shipbuilders, Surveyors, &c. With Appendix for the Use of Electrical Engineers, by Professor JAMIESON, F.R.S.E. SEVENTH EDITION. 10s. 6d.

Manual of). Comprising Engineering
Surveys, Earthwork, Foundations,
Masonry, Carpentry, Metal Work, Roads,
Railways, Canals, Rivers, Waterworks,
Harbours, &c. With Numerous Tables
and Illustrations. TWENTY-FIRST EDI-
TION. 168.

III. MACHINERY AND MILL- VI.

MECHANICAL TEXT

WORK (A Manual of). The Geometry,
Motions, Work, Strength, Construction,
and Objects of Machines, &c. With
nearly 300 Woodcuts. SEVENTH EDI-
12s. 6d.

BOOK: A Practical and Simple Intro-
duction to the Study of Mechanics. By
Professor RANKINE and E. F. BAMBER,
C.E. With numerous Illustrations.
FIFTH EDITION. 9s.

TION.

LONDON: CHARLES GRIFFIN & CO., LTD., EXETER STREET, STRAND, W.C.

DRAWING AND DESIGN

(A TEXT-BOOK OF):

INCLUDING

Practical Geometry, Plane and Solid, and Machine
and Engine Drawing and Design.

BY

SIDNEY H. WELLS, WH.Sc.,

A.M.INST.C.E., A.M.INST.MECH.E.,

PRINCIPAL OF, AND HEAD OF THE ENGINEERING DEPARTMENT IN THE BATTERSEA POLYTECHNIO
INSTITUTE; FORMERLY OF THE ENGINEERING DEPARTMENTS OF THE YORKSHIRE
COLLEGE, LEEDS; AND DULWICH COLLEGE, LONDON.

With Numerous Illustrations and Examples, specially intended for the Use
of Students of Technical Schools and Colleges.

PART I-PRACTICAL GEOMETRY.

Third Edition.

LONDON:

CHARLES GRIFFIN & COMPANY, LIMITED;

EXETER STREET,

1900.

[All Rights Reserved.]

STRAND.

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PREFACE TO THE FIRST EDITION.

THIS book is intended for the use of Engineering students in schools and colleges, and as a text-book for examinations in which a knowledge of Practical Geometry and Machine Drawing is required.

The chief reason which has led to its preparation is that during the time I was engaged in teaching on the Engineering side of Dulwich College, and had charge of the classes in Geometrical and Mechanical Drawing, I found it impossible to obtain a book wherein the problems, or examples, were not accompanied by diagrams which the student could easily copy, without in the least knowing to what they referred. In Plane and Solid Geometry there was a lack of properly graduated questions, and such important parts of the subject as problems on loci, the construction of the useful plane curves and their practical application to cams and wheel-teeth, the interpenetration and development of simple solids, and isometric projection were only to be found in advanced books-although really more suited for elementary students than the troublesome problems on

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