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).
Specification sheet detailing the gap and depression measurements for a push-button switch.
| Identifier | ExFiles\Box 34\3\ Scan036 | |
| Date | 2nd August 1919 | |
| 2.8.19. PUSH BUTTON SWITCH X.2641. X.1627. Position. Carbon gap. Copper gap. Button depression. Off .040+ 15 .060+ 20 0 Carbons just 0 .033+ 10 .020+ 7 in contact. Coppers just 0 0 .045+ 15 (total) in contact. | ||