| Year | 1933 |
| Date | 09-Nov |
| Volume | 69 |
| Issue | 1,696 |
| Page | 443 |
| Category | General |
| Part | |
| Title | Speedometers and Tachometers |
| Author | Alfred W.Marshall |
| Notes | Inexpensive Instruments for Use with Pedal-driven Cycles, Small Engines and other Machines. An early interest in speedometers, some mechanisations and principles, making a speedometer, lure of experimenting |