| Year | 1926 |
| Date | 25-Mar |
| Volume | 54 |
| Issue | 1,300 |
| Page | 337 |
| Category | General |
| Part | |
| Title | Practice Versus Theory. Another Whistle Echo |
| Author | A.H.Stuart |
| Notes | How the dynamo was invented, long-distance telephony, perpetual motion, what is a practical man? More about whistles |