| Year | 1977 |
| Date | 01-Jul |
| Volume | 143 |
| Issue | 3,564 |
| Page | 733 |
| Category | Stationary Engine |
| Part | 5 |
| Title | "Mary". A Four-Column Beam Engine |
| Author | "Tubal Cain" |
| Notes | Connecting rod, bearing bushes, straps, cotters, beam pivots, parallel motion links, pivot bolt, drop arm, thrust links, valve gear |