| Year | 1923 |
| Date | 20-Sep |
| Volume | 49 |
| Issue | 1,169 |
| Page | 322 |
| Category | Railway |
| Part | 5 |
| Title | Some Notes on the Development of Railway Signalling |
| Author | E.H.Ellingham |
| Notes | Points. Arrangement of railway points, lock bar for locking points, layout of double junction, point detectors, a battery of point detectors |