From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Diagram illustrating the operation of a contact breaker mechanism in two states.
| Identifier | ExFiles\Box 164\1\ img006 | |
| Date | 20th January 1931 guessed | |
| DRIVING CATCH., ARMATURE, DRIVING SPRING, BREAKING PUSH., CONTACT., CONTACT BROKEN | ||