| Year | 1915 |
| Date | 07-Jan |
| Volume | 32 |
| Issue | 715 |
| Page | 11 |
| Category | Electrical |
| Part | |
| Title | Breaks for Spark Coils |
| Author | J.Pike |
| Notes | Motor-actuated mercury break in part, simplest form of mercury jet, contact & spindle of mercury jet, two old types of electro-motors for revolving mercury jet drum, Gaiffe's patent automatic break, arrangement of connections, commutator, form of motor obviating the use of bobbins, another form of motor, metal cup |