| Year | 1920 |
| Date | 16-Sep |
| Volume | 43 |
| Issue | 1,012 |
| Page | 226 |
| Category | Railway |
| Part | |
| Title | Railway Signalling Systems |
| Author | F.Raynar Wilson |
| Notes | Victorian Government Railways. Chapter 11. - Electro Pneumatic Semi-automatic Signals. Circuit breaker, semi-automatic signal detection |