| Year | 1998 |
| Date | 13-Feb |
| Volume | 180 |
| Issue | 4,061 |
| Page | 208 |
| Category | General |
| Part | |
| Title | Leonardo's Ratchet Winch |
| Author | Bernard R.Ambrose |
| Notes | Modelling conjectural designs. The model, drawings, base, main bearings, winch bearing assembly, lantern pinion and winch shaft, string guard, handle, main shaft and keys, ratchet gear assembly, trial assembly, painting and final assembly |