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).
Comparison sketch of a standard (STD) pulley and a suggested pulley design.
| Identifier | ExFiles\Box 94\5\ scan0022 | |
| Date | 14th December 1936 guessed | |
| STD PULLEY (P III) E 85919 LOCATION ON SPIGOT HERE SUGGESTED PULLEY PRESSINGS SPOT WELD STEEL PRESSINGS .083 (14SWG) SK 5028 | ||