| Year | 1929 |
| Date | 14-Mar |
| Volume | 60 |
| Issue | 1,453 |
| Page | 257 |
| Category | Practical Letters from Our Readers |
| Part | |
| Title | Fan Brake for Small Engines |
| Author | Edgar T.Westbury |
| Notes | Torque reaction brake, compensated band brake (with Ferodo band), water-cooled Prony brake |