| Year | 1932 |
| Date | 10-Nov |
| Volume | 67 |
| Issue | 1,644 |
| Page | 446 |
| Category | Electrical |
| Part | |
| Title | Electrical Timing Devices |
| Author | Edgar T.Westbury |
| Notes | Track ramp contact-making device, thread-controlled contact-maker, electro-magnetic device for controlling stop-watch, diagram of chronograph mechanism, typical chronograph record, the chronograph |