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).
Extract from a report comparing the pressure required for a new press button switch to previous models.
| Identifier | ExFiles\Box 64\4\ scan0286 | |
| Date | 30th May 1929 | |
| 30.5.29. Extract taken from Mr. Hancock's report of 2.5.29. X.7655. PRESS BUTTON SWITCH LOP. D.72088 LEC 2641. The press button switch required considerable more pressure to operate than previous push switches. We much prefer the lighter touch. | ||