| Year | 1923 |
| Date | 27-Sep |
| Volume | 49 |
| Issue | 1,170 |
| Page | 343 |
| Category | Stationary Engine |
| Part | |
| Title | A Single-Acting Vertical Engine |
| Author | William W.Hollis |
| Notes | Steam, governor driving gear, arrangement of exhaust ports, cylinder base showing steam and inlet passages, front view, method of operating steam inlet and exhaust taps |