| 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]; | 29 |
| [A set of inexpensive drawing instruments]; | 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-sectionpaper]; [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]; | 63 |
| [A lever of the second class]; [wire splicing clamps] | 63 |
| [A lever of the third class]; | 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]; [apulsating direct current]; [an alternating current]; [alternatingcurrent changed into an interrupted direct 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 fromthe 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 |