| Year | 1927 |
| Date | 01-Dec |
| Volume | 57 |
| Issue | 1,386 |
| Page | 526 |
| Category | Practical Letters from Our Readers |
| Part | |
| Title | Thick Walled Cylinders; and Clocks |
| Author | Fred Pollock |
| Notes | Arrangement of combined drain and relief valves, star wheel contact, view of clock chiming gear |