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SHOP MATHEMATICS

PART I

SHOP ARITHMETIC

UNIVERSITY OF WISCONSIN

EXTENSION TEXTS

A series of Industrial and Engineering Education Textbooks, developed under the direction of Dean Louis E. REBER,

University of Wisconsin Extension Division

Norris and Smith's
SHOP ARITHMETIC
Norris and Craigo's
ADVANCED SHOP MATHEMAT-

ICS
Hills'
MACHINE DRAWING
George's
ADVANCED SHOP DRAWING
Wooley and Meredith's
SHOP SKETCHING
Longfield's
SHEET METAL DRAFTING
Hobbs, Elliott, and Consoliver's
GASOLINE AUTOMOBILE
Norris, Winning, and Weaver's
GAS ENGINE IGNITION
Consoliver and Mitchell's
AUTOMOTIVE IGNITION

SYSTEMS
Shealy's
HEAT
Shealy's
STEAM BOILERS
Shealy's
STEAM ENGINES
Jansky's
ELECTRICAL METERS
Jansky's
THEORY AND OPERATION OF

D.-C. MACHINERY

Jansky's
ELEMENTARY MAGNETISM AND

ELECTRICITY
Jansky's
PRINCIPLES OF RADIOTELEG-

RAPHY Jansky and Faber's PRINCIPLES OF THE TELE

PHONE

Part 1.-Subscribers' Apparatus
Hool's
ELEMENTS OF STRUCTURES
Hool's
REINFORCED CONCRETE CON-

STRUCTION
Vol 1.-Funa mental Principles
Vol. II.-Retaining Walls and

Buildings
Vol. III.-Bridges and Culverts
Blair's
SHOW-CARD WRITING
Pulver's
MATERIALS OF CONSTRUCTION
Wines'
STRENGTH OF MATERIALS
Jansky's
ELEMENTS OF STORAGE

BATTERIES Koehler's THE PROPERTIES AND USES OF WOOD

SHOP MATHEMATICS

PART I
SHOP ARITHMETIC

PREPARED IN THE

EXTENSION DIVISION OF
THE UNIVERSITY OF WISCONSIN

BY

EARLE B. NORRIS, M. E.
Dean of Engineering, University of Montana; Formerly Professor
of Mechanical Engineering, in charge of Mechanical Engineer-

ing Courses in the University Extension Division

AND

KENNETH G. SMITH, A. B., B. S.
State Supervisor of Industrial Education, Lansing, Michigan; Formerly
Associate Professor of Mechanical Engineering, in charge of

Milwaukee District, University Extension Division

SECOND EDITION

MCGRAW-HILL BOOK COMPANY, INC.
NEW YORK: 370 SEVENTH AVENUE
LONDON: 6 & 8 BOUVERIE ST., E. C. 4

COPYRIGHT, 1913, 1924, BY THE
McGraw-Hill Book COMPANY, INC.

PRINTED IN THE UNITED STATES OF AMERICA

THE MAPLE PRESS COMPANY, YORK, PA.

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In bringing out a second edition of Shop Arithmetic, sincere gratification is expressed for the reception accorded the first edition which ran through seventeen impressions. Twelve years ago there was great need for a plain, practical, interesting text of this kind. The University Extension Division of the University of Wisconsin, for lack of such a book, was obliged to produce this volume in connection with its work. Immediately upon its publication many other Extension Divisions adopted and used the book both for correspondence and class instruction. It has likewise been widely used in trade, continuation, shop, apprentice, and other schools of like character. This extensive use with extraordinary variations in student types has resulted in practical suggestions for change and improvement that have been incorporated in the present revision.

Two entirely new chapters have been added to the book, one on Logarithms and one on the Slide Rule. This additional text material has been found to be desirable particularly for those students who plan to go forward with subsequent studies in industrial or engineering courses.

Mr. Herbert E. Schrader, while instructor in Mechanical Engineering in the University Extension Division, prepared both the new material and the text of the revision. He is to be commended upon the success he achieved in incorporating the newer ideas and later practices in the spirit of the original work. Much valuable assistance and counsel were given by Mr. W. E. Wines and Mr. Herbert B. Byrn of our present staff. Due acknowledgment is also made to the many users of the first edition who made valuable suggestions and contributions towards this revision. It is hoped that this new edition will commend itself to old friends and win new ones.

BEN G. ELLIOTT.
Professor of Mechanical Engineering
In charge of Mechanical Engineering Courses

University Extension Division
Madison, WISCONSIN

June, 1924.

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