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 Ferflex Braided electric cable.
| Identifier | ExFiles\Box 168b\2\ img114 | |
| Date | 14th September 1923 | |
| Revised 14.9.23. SPECIFICATION NUMBER 286. FERFLEX BRAIDED. MATERIAL. Electric Cable. 600 megohm grade. TYPE OF CORE. 4-Core. CORE SIZE. 2-70/36. 2-40/36. OUTSIDE DIAMETER. .470 maximum. CONDUCTOR. High Conductivity Tinned Copper Wire. DIELECTRIC. One layer pure rubber and two layers vulcanising rubber. The radial thickness of pure rubber shall be at least .006 and the total thickness of the dielectric must be .035 minimum. PROTECTIVE COVERING. Each core to be taped. One 70/36 coloured red and the other white. One 40/36 coloured black and the other green. Cores to be twisted together and wormed circular with cotton. Taped and protected overall with a Ferflex braid of 36 S.W.G. tinned copper wire. | ||