| Year | 1921 |
| Date | 14-Apr |
| Volume | 44 |
| Issue | 1,042 |
| Page | 289 |
| Category | Automotive |
| Part | |
| Title | Motor Cycle Notes |
| Author | "Phoenix" |
| Notes | Origin of the "Gradua" Gear. A Sparking Plug Query. Aluminium Alloy Pistons. Irregular Working of Twin-cylinder Engine. Replies in Brief |