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 electric cable.
| Identifier | ExFiles\Box 168b\2\ img096 | |
| Date | 30th November 1922 | |
| ROLLS ROYCE LIMITED MATERIAL Electric Cable. SPECIFICATION NUMBER 261 TYPE OF CORE Single. CORE SIZE 70/36 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. Total radial thickness of whole .035". Radial thickness of pure rubber .006". Rubber shall be equal in quality to First Quality Plantation Rubber. Vulcanizing Rubber shall contain at least 40% pure rubber. Mineral fillers only shall be used. Proportion by weight of sulphur shall not exceed 2.5%. PROTECTIVE COVERING Soft Cotton braiding, either paraffined overall so that the cable will not slip or fray when cut, or compounded black. Colour and finish required will be specified on our orders. | ||