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).
Specifying the type of pistons for the first 100 sets for the Wraith model.
| Identifier | ExFiles\Box 9\1\ 01-page09 | |
| Date | 17th January 1938 | |
| 636. BY/CS Rm.{William Robotham - Chief Engineer} --- BY/Mtn9/N.17.1.38. ------------------ Wraith - Pistons - 100 sets. ---------------------------- Kindly note the first 100 sets of Pistons should be the present standard 25/30 h.p. type. We understand from RHC.{R. H. Coverley - Production Engineer} that only one of the first six experimental production cars will be fitted with High Pressure Rings. BY/Mtn. | ||