| Year | 1946 |
| Date | 14-Mar |
| Volume | 94 |
| Issue | 2,340 |
| Page | 265 |
| Category | Railway |
| Part | 2 |
| Title | Railway Interlocking Frames. The Stevens Apparatus - Part 2 |
| Author | O.S.Nock |
| Notes | Stevens frame - elevation showing mounting of levers, base casting, locking trough, principle of tappet locking, support for locking trough |