| Year | 1931 |
| Date | 05-Feb |
| Volume | 64 |
| Issue | 1,552 |
| Page | 134 |
| Category | Electrical |
| Part | |
| Title | Electrical Questions and Answers |
| Author | Frederick H.Taylor |
| Notes | A cluster of three (or more) lamps controlled by two switches, method of looping the live switch wire at the rose instead of at the switches |