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.
| Identifier | ExFiles\Box 168b\2\ img101 | |
| Date | 14th September 1923 | |
| Revised 14-9-23. ROLLS-ROYCE LIMITED. Specification Number 252. MATERIAL. ELECTRIC CABLE. 600 megohm grade. TYPE OF CORE. Single. CORE SIZE. 84/25. OUTSIDE DIAMETER. .425 Maximum. CONDUCTOR. High Conductivity Tinned Copper Wire. DIELECTRIC. One layer pure rubber and two layers vulcanizing rubber. Total thickness of dielectric not less than .050". The thickness of pure rubber must be at least .007". PROTECTIVE COVERING. Oil-resisting varnished cable cloth applied spirally. Cotton braided, and compounded black. Workshop finish. | ||