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).
Blueprint diagram illustrating the setup of an indicator clock on the centre main bearing of a 25 HP inverted top half crankcase.
| Identifier | ExFiles\Box 103\2\ scan0247 | |
| Date | 19th August 1931 guessed | |
| SUPPORT INDICATOR CLOCK ON CENTRE MAIN BEARING. SUPPORT. CRANKCASE 25 H.P. (INVERTED TOP HALF) | ||