| Year | 2021 |
| Date | 12-Feb |
| Volume | 226 |
| Issue | 4,658 |
| Page | 285 |
| Category | Stationary Engine |
| Part | 3 |
| Title | The Middleton Double 'Monitor' Type Engine |
| Author | Rodney Oldfield |
| Notes | Constructs another of Bob Middleton's small but interesting engines. Steam chest, steam chest cover, slide valve, slide valve rod, slide valve gland, steam chest outrigger, valve rocker, valve rod end, valve rocker pin, rocker shaft bearings |