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).
Instructions for rear axle gear ratios and pitch.
| Identifier | ExFiles\Box 2\6\ B002_X 140 141 157-page011 | |
| Date | 21th February 1912 | |
| COPY. TBB8/L21212. X190 February 21st 1912. Ref. N3/B15212. Re Rear Axle. Mr Bailey has instructed the 17/52 gears of 4's pitch on February 17th and this ratio with 16teeth on pinion on February 19th. X783 | ||