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 Electric Cable, 600 Megohm Grade, with Ferflex Braiding.
| Identifier | ExFiles\Box 168b\2\ img092 | |
| Date | 30th November 1922 | |
| ROLLS ROYCE LIMITED MATERIAL Electric Cable. 600 Megohm Grade. SPECIFICATION NUMBER 254. Ferflex Braided. TYPE OF CORE Twin. CORE SIZE 2 - 90/36. OUTSIDE DIAMETER .422 Maximum. CONDUCTOR High Conductivity Tinned Copper Wire. DIELECTRIC One layer pure and two layers vulcanizing Rubber, both to be equal in quality to First Grade Plantation Rubber. Vulcanizing Rubber to contain at least 40% Pure Rubber mineral fillers only to be used. Proportion by weight of sulphur not to exceed 2.5%. The radial thickness of the pure rubber shall be at least .006 and the total thickness of the dielectric must be .035 minimum. PROTECTIVE COVERING Each core taped. One core coloured Red and the other white. Cores twisted together and wormed circular with cotton. Taped and protected overall with a ferflex braid of 36 SWG. Tinned Copper Wire. | ||