ILLUSTRATIONS
Reading edition
PAGE
Patent granted to the author Frontispiece
A popular idea of an inventive genius 2
Where the big idea really originates 3
A model self-inking printing press 9
A velocipede scroll saw with boring attachment 10
A standard single cylinder air pump 11
A horizontal steam engine 12
A fireless cooker 13
A loud speaking telephone largely used on ship-board 14
A common electric bell 15
An ordinary telegraph sounder 16
A telautograph 17
The gyro compass of a ship 18
A twelve inch rule 19
A pair of cheap compasses 19
An isometric perspective drawing of a box 20
Top, side and end view of same 20
Cross-section of same; drawing of hook 21
Side view of a steam engine 22
End view of same 23
Top view of same 24
Cross-section of same 24
The side valve shown in detail 25
An isometric perspective drawing of a steam engine 25
A sheet of isometric drawing paper 26
First step in isometric perspective drawing 27
The next step in isometric perspective drawing 27
A crank shaft drawn on isometric paper 28
A drawing board; a triangular scale 29
A set of inexpensive drawing instruments; a protractor 30
The position of the protractor on paper 31
The proportion of an isometric ellipse 32
How ellipses stand out in relief 33
How an isometric ellipse is drawn 34
Shading and lettering chart for drawings 35
Chart of electrical symbols 37, 38
A simple wiring diagram 39
Aids to drawing a manikin; proportions drawn on cross-section paper; trial positions of manikin 40-42
Cardboard model of a gyro engine 44
The Official Gazette; Patent specifications; Index to Patents 53
A lever of the first class; a pair of pliers 63
A lever of the second class; wire splicing clamps 63
A lever of the third class; a pair of sugar tongs 64
A bent lever 65
A compound lever 65
Wheel and axle 66
A train of wheels or wheel works 66
A fixed pulley 67
An incline plane and one of its uses 67
A simple wedge; a printer’s quoin 68
The theory of a screw; a screw clamp 68
Some useful mechanical movements 70-73
A steady direct current; an interrupted direct current; a pulsating direct current; an alternating current; alternating current changed into an interrupted direct current; a periodic oscillating current; a sustained oscillating current 76-78
Some useful electro-mechanical devices 80-81
An ammeter; a voltmeter 82
A resistance box 83
Side and end view of a winding device 84
Making a ruby by chemistry; ruby boules as they come from the furnace; synthetic rubies after they are cut 85
Some useful chemical apparatus 87
An electric furnace showing parts and in operation 88-89
Rough model of an electric motor drive for a locomotive 92
A scale model of an aeroplane 93
A toy helicopter 94
A working model of a locomotive 95
Some useful jewelers’ and machinists’ tools 101
A small hand drill press 102
A foot power screw-cutting lathe 103
A vernier for accurate measurement 103
A micrometer 105
A standard wire gage 106
Useful stock materials made by automatic machinery 107
A standard for a telegraph sounder 109
Pouring a mould 110
Rules of Practice of the Patent Office 116
A page of drawings 121
Specification of one of Mr. Collins’ patents 123
The Claims of the same patent 123
The U. S. Patent Office, Washington, D. C. 129
Certificate of Incorporation 139
Stock certificate 141
A seal press 142
A gas furnace 150
A grinder and polisher 151
A plain lathe for turning metal with hand tools 152
An engine lathe 153
Pillar type of power drill 154
A planer for surfacing metal work 154
A shaper for shaping up metal work 155
A universal milling machine 156
A jig saw 157
A band saw 158
A time stamp 162
A high frequency machine 163
From manufacturer to canvasser, to consumer 167
From manufacturer to order agent, to consumer 169
From manufacturer to his agent, to consumer 172
Selling direct from factory to consumer 173
Selling through the trade 174
Old style and improved tooth brush 182
The old and the new way in sweeping carpets 183
A labor saving painting machine 184
A quick figuring and bookkeeping machine 185
A rubber dagger 186
Bumping-the-bumps 187
A novel, life-saving gun 188
The Owen magnetic clutch 189
A gyro stabilizer 189
A liquid air machine 190
The cheapest form of light 190
A tube system of electric light 191
The high tension electric generator 192
Cutting steel girders with oxy-acetylene 193
Apparatus for prevention of mine disasters 194
A steel plate engraving machine 195
An attempt to improve the movies 196
Tesla’s tower at Wardencliffe, L. I. 197
A perpetual motion machine 198
Perpetual motion as seen by a patent attorney 199
The first telephone 205
The first typewriter 206
The first phonograph 207
The first incandescent light 210
Collins wireless telephone 214
Design patent 216
A registered trade mark 220
Application blank for copyright of a book 222-223
Cross-section of gear 238
The four chief thermometric scales 251
INVENTING FOR BOYS