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).
Hand-drawn schematic of a timing gear drive system with annotations for components and dimensions.
| Identifier | ExFiles\Box 126\2\ scan0146 | |
| Date | 18th November 1938 guessed | |
| TIMING GEAR DRIVE SS{S. Smith} 220 DUPLEX CHAIN TOTAL LENGTH = 36" PITCH = 3/8" DYNAMO ETC DRIVE 22 TEETH 2 3/4" DIA CAMSHAFT DRIVE 50 TEETH 6" DIA CRANKSHAFT 25 TEETH 3 1/8" DIA 25 TEETH 3" DIA RENOLDS TENSIONER CRANKCASE & CYLS 9 1/8" 4 1/4" 3 1/2" 5 1/2" 4 3/4" 2 3/4" | ||