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).
The cost difference for fitting helical gears to old type 40/50 chassis.
| Identifier | ExFiles\Box 171\3\ img101 | |
| Date | 24th August 1921 | |
| Hs.{Lord Ernest Hives - Chair} from Rd. 24.8.21. HELICAL GEARS TO OLD TYPE 40/50 CHASSIS. Difference-per-car. Prior to chassis No.1550 £.34. 0. 0 charged to customer including profit. From chassis No.1550 to 2299 £31. 15. 0 " " " " D/Rd 23.8.21. W H H 329F (700 B) (4TH ISS 10-12-20) (F 356) | ||