Inventing for Boys

CONTENTS

CHAPTER		PAGE
	Preface	vii
I.	GETTING AN IDEA	1
	How to Get an Idea
	The First Raw Idea.—Accidental Discoveries.—Thought out Ideas.—Reading up Your Subject.—Working out Ideas by Experiment.—Ideas for Inventions in General.—Ideas for Mechanical Inventions.—Ideas for Electrical Inventions.—Ideas for Electro-Mechanical Inventions.—Ideas for Chemical Inventions.—Ideas for Electro-Chemical Inventions.
	Protecting Your Raw Ideas
II.	WORKING IT OUT ON PAPER	19
	Tools for Making Simple Drawings
	How to Make Simple Working Drawings
	A Simple Way to Draw in Perspective
	How to Make Isometric Paper.—Drawing Tools you Need.
	How to Draw Isometric Ellipses
	An Easy, Rough Way and a Hard, Accurate Way.
	How to Shade Drawings
	How to Make Electrical Symbols
	How to Read Electrical Diagrams
	Some Aids to Drawing
	Making Cardboard Models
III.	THE STATE OF THE ART	45
	What is Meant by the State of the Art
	Use of the State of the Art
	How to Learn the State of the Art
	Having a Patent Attorney Look It Up
	How to Look It Up Yourself
	What to Do When You Find
	(a) There are no other improvements like yours.—(b) That there is a resemblance to yours.—(c) When others are exactly like yours.
IV.	HOW TO EXPERIMENT	58
	How to Experiment with Machines
	Work, Energy and Power.—Work Against Friction.—Forms of Energy.
	Machines and the Principles of Machinery
	The Uses of Machines
	The Six Mechanical Powers
	Copyrights
	Government Fees for Patents and Least Charges of Patent Attorneys
	Foreign Patents
APPENDICES		229-252
SOME WORDS and Terms Used in This Book		253-260
INDEX		261-270

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