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).
Requesting an increase in the locking effect for the Spectre Gearbox by altering a cam angle.
| Identifier | ExFiles\Box 94\1\ scan0022 | |
| Date | 9th July 1934 | |
| To Mr. [REDACTED] from HDY.{William Hardy} C. [REDACTED] HDY.{William Hardy}2/HP.9.7.34. Handwritten: 4669F 328 SpectreCodename for Phantom III Gearbox. ----------- Will you kindly increase the locking effect given by the cam on the 2nd speed S.M. sleeve by increasing the angle made between the cam surface and the axis of the layshaft from 45° to 50°. The length of the cam surface on the pin when projected on to the axis of the shaft should remain unaltered as shewn on N.Sch.4013. HDY.{William Hardy} | ||