| Year | 1955 |
| Date | 05-May |
| Volume | 112 |
| Issue | 2,815 |
| Page | 494 |
| Category | Nautical |
| Part | |
| Title | A Gearbox for a Twin-screw Boat |
| Author | R.H.Mapplebeck |
| Notes | Arrangement of gear train, the form tool, the gear cutter, gear dimensions, the spindles, gearbox housing, bearing bushes, assembling |