| Year | 1920 |
| Date | 14-Oct |
| Volume | 43 |
| Issue | 1,016 |
| Page | 315 |
| Category | Railway |
| Part | |
| Title | Automatic Model Electric Railway Signals |
| Author | James W.Bulman |
| Notes | General arrangement, digrammatic sketch of signal connections, signal mechanism & ramps for track, connections for signals on length of track |