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 a single core electric cable.
| Identifier | ExFiles\Box 168b\2\ img107 | |
| Date | 14th October 1923 | |
| 14th October, 1923. ROLLS-ROYCE LIMITED. Specification Number 261A. (Cancelling Specification 261 of 30-11-22). MATERIAL. ELECTRIC CABLE. 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, .030". Radial thickness of pure rubber, .006". PROTECTIVE COVERING. Single layer of varnished cable cloth, braid of polished cotton yarn and treated with Gloy adhesive during braiding to prevent slipping or fraying of braiding material. Colour of braid as specified on our orders. | ||