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 document detailing the construction of cables for the R.R. Goshawk wiring system.
| Identifier | ExFiles\Box 45\3\ Scan157 | |
| Date | 13th January 1922 | |
| January 13th, 1922. X.4075 - SPECIFICATION OF CABLES FOR R.R. GOSHAWK WIRING SYSTEM. Specification I. Cable. 40/36's tinned copper, high conductivity. Insulated. 1st. Thin layer pure rubber. 2nd. Layer white vulcanised rubber. 3rd. Layer black vulcanised rubber. 4th. Layer of impregnated thin cotton braiding of desired colour, namely, red. Total overall dia. not to exceed .187. Specification 2. Cable. 70/36's tinned copper, high conductivity. Insulated. 1st. Thin layer pure rubber. 2nd. Layer white vulcanised rubber. 3rd. Layer black vulcanised rubber. 4th. Layer of impregnated thin cotton braiding of desired colour, namely, blue. Total overall dia. not to exceed .187". Specification 3 Cable. 12 - 7/25's tinned copper H.C. Insulated. 1st. Thin layer pure rubber. 2nd. Layer white vulcanised rubber. 3rd. Layer black vulcanised rubber. 4th. Layer thin tape. 5th. Layer of impregnated braiding, black in colo-ur, overall diameter not to exceed .425. J | ||