| Year | 1923 |
| Date | 06-Sep |
| Volume | 49 |
| Issue | 1,167 |
| Page | 267 |
| Category | Railway |
| Part | 3 |
| Title | Some Notes on the Development of Railway Signalling |
| Author | E.H.Ellingham |
| Notes | The Signal. Types of semaphore signal, signal arm pivoted in the middle, lever and counterweight |