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 a single core, braided electric cable.
| Identifier | ExFiles\Box 168b\2\ img089 | |
| Date | 30th March 1933 | |
| ROLLS ROYCE LIMITED. MATERIAL: Electric Cable. 600 Megohm Grade. SPECIFICATION NUMBER: 251. Perflex Braided. TYPE OF CORE: Single. CORE SIZE: 70/36 OUTSIDE DIAMETER: .225" Maximum. CONDUCTOR: High Conductivity Tinned Copper Wire. DIELECTRIC: One layer pure rubber and two layers vulcanizing rubber, both to be equal in quality to First Grade Plantation Rubber. The vulcanizing rubber shall contain at least 40% Pure Rubber. Mineral Fillers only to be used. Proportion by weight of sulphur shall not 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: Oil resisting varnished cambric tape applied spirally. Protected overall with a Ferflex braid of 36 SWG. Tinned Copper Wire. | ||