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).
Specification for Half Charge Switching on a 20/25 HP Chassis.
| Identifier | ExFiles\Box 163\6\ img025 | |
| Date | 3rd April 1940 | |
| X6016. EFC. BY/RD2/W.3-4-40. Re :- Half Charge Switching for 20/25 H.P.Chassis. With reference to your EFC2/AD2-4-30; will you please note that the Specification on 18-G-4 was settled early in March and the above item was included. BY/RD. | ||