| Year | 1939 |
| Date | 27-Apr |
| Volume | 80 |
| Issue | 1,981 |
| Page | 479 |
| Category | Nautical |
| Part | |
| Title | Timing Gear for Speedboats |
| Author | P.Ivison |
| Notes | Experimental apparatus. Time and lap recording gear side view, make and break for clock, centre pole make and break, details of solenoid, front view showing clock and governor, back view |