| 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 |
| INVENTING FOR BOYS
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