| Year | 1929 |
| Date | 21-Feb |
| Volume | 60 |
| Issue | 1,450 |
| Page | 186 |
| Category | Practical Letters from Our Readers |
| Part | |
| Title | Air Fan Brakes |
| Author | B.G.M. |
| Notes | Sketch of type of high-speed friction brake used by the writer, arrangement of tape for greatest sensitiveness |