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).
Secret memo regarding pressure angle adjustments for the Spectre Gear Box, N. Scheme 4414.
| Identifier | ExFiles\Box 94\1\ scan0106 | |
| Date | 28th March 1935 | |
| Mdy. from Sft.{Mr Swift} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Dy.{F R Danby} RIO. Worr. E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} Dav. 1326 Secret. Sft{Mr Swift}1/BH.28.3.35. SPECTRECodename for Phantom III GEAR BOX. N. SCHEME 4414. We can give you the slight difference of angle called for, without the addition of any new equipment. Our present diamond trimming devices are adjustable and will accommodate the 10' difference between the two pressure angles. We can give you a 40°30' pressure on the driving side, and 40°40' on the driven side, and as far as we are concerned, there is no reason why some sets should not be instructed. Sft.{Mr Swift} | ||