By CHARLES WESTINGHOUSE Over 200 Illustrations and 160 Pages. Price, $2.00

A COMPLETE SELF-INSTRUCTOR FOR HOME STUDY on 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 - Material 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.

Frederick J. Drake & Co., Publishers

350-352 WABASH AVENUE, CHICAGO, U. S. A.

THE KING OF ALL - The Companion Volume to Modern Wiring Diagrams - Just from the Press

Electrical Wiring and Construction Tables

By Henry C. Horstmann and Victor H. Tousley

Contains hundreds of easy up-to-date tables covering everything on Electric Wiring

Bound in full Persian Morocco.

Pocket size. Round corners, red edges.

PRICE, MET, $1.50

Partial Table of Contents

This Book contains among others:

Tables for direct current calculations. Tables for alternating current calculations. These tables show at a glance the currents required with any of the systems in general use. for any voltage, efficiency, or power-factor, and by a very simple calculation (which can be mentally made), also the proper wire for any loss. Tables showing the smallest wire permissable with any system or number of H. P. or lights under "National Electrical Code" or Chicago rules. Very convenient for contractors. Tables for calculating the most economical loss. Tables and diagrams showing proper size of conduits to accommodate all necessary combinations or number of wires. Tables and data for estimating at. a glance the quantity of material required in different lines of work.

AS this is intended for a pocket-hand-book everything that would makes it unnecessarily cumbersome is omitted. There is no padding. Every page is valuable and a time saver. This book will be used every day be the wireman, the contractor, engineer and architect. All parts are so simple that very little electrical knowledge is required to understand them.

Sent, all charges paid to any address, upon receipt of price.

FREDERICK J. DRAKE &CO., Publishers, 350 Wabash Ave., Chicago