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\ img097 | |
| Date | 30th November 1922 | |
| ROLLS ROYCE LIMITED. 30 NOV. 1922 MATERIAL Electric Cable. SPECIFICATION NUMBER 262 TYPE OF CORE Single. CORE SIZE 23/36 OUTSIDE DIAMETER .130 maximum. 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 Grade Plantation Rubber. 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%. PROTECTIVE COVERING Braided in Soft Orange Coloured Cotton Paraffined overall so that the Braiding material will not fray or slip when the cable is cut. | ||