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).
Material and construction specification for a single core electric cable.
| Identifier | ExFiles\Box 168b\2\ img083 | |
| Date | 23th October 1917 | |
| ROLLS ROYCE LIMITED MATERIAL: Electric Cable SPECIFICATION NUMBER: 260 TYPE OF CORE: Single CORE SIZES: 40/36 OUTSIDE DIAMETER: Maximum .187 CONDUCTOR: High Conductivity Tinned Copper Wire DIELECTRIC: One layer pure rubber, one layer white vulcanizing rubber, and one layer black vulcanizing rubber, all to be equal in quality to First Grade Plantation Rubber. Vulcanised rubber to contain at least 40% Pure Rubber. Mineral fillers only to be used. Proportion of sulphur by weight not to exceed 2.5%. Total radial thickness of rubber .035". PROTECTIVE COVERING: One layer of impregnated thin cotton and braiding coloured either neutral - green - Black and white speckled, or Blue, as specified on our orders. | ||