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 sheet for two types of Ferflex braided electrical cable.
| Identifier | ExFiles\Box 168b\2\ img111 | |
| Date | 14th September 1923 | |
| X. 802 Revised 14.9.23. ROLLS-ROYCE LIMITED. SPECIFICATION NUMBER 250. FERFLEX BRAIDED. MATERIAL. Electrical Cable. 600 Megohm Grade. TYPE OF CORE. Single. CORE SIZE. 40/36. OUTSIDE DIA. .200" Maximum. CONDUCTOR. High Conductivity Tinned Copper Wire. DIELECTRIC. One layer pure rubber and two layers vulcanizing rubber. The radial thickness of the pure rubber must be at least .006". Total radial thickness of dielectric must be at least .035". PROTECTIVE COVERING. Oil resisting varnished cable cloth applied spirally. Protected overall with a Ferflex braid of 36 S.W.G., tinned copper wire. SPECIFICATION NUMBER 251. FERFLEX BRAIDED. MATERIAL. Electric cable. 600 megohm grade. TYPE OF CORE. Single. CORE SIZE. 70/36. OUTSIDE DIA. .225" Maximum. CONDUCTOR. High Conductivity Tinned Copper Wire. DIELECTRIC. One layer pure rubber and two layers vulcanizing rubber. 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. Oil-resisting varnished cable cloth applied spirally. Protected overall with a Ferflex braid of 36 S.W.G., tinned copper wire. | ||