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 Workshop Twin Flex electric cable.
| Identifier | ExFiles\Box 168b\2\ img109 | |
| Date | 14th October 1923 | |
| Y. 802 Sp{Mr Spinney} 14th October, 1923. ROLLS-ROYCE LIMITED. Specification Number 263. (Workshop Twin Flex). MATERIAL. ELECTRIC CABLE. TYPE OF CORE. Single. CORE SIZE. 22/38. OUTSIDE DIAMETER. .115 maximum each cable. CONDUCTOR. May be either Tinned High Conductivity Copper Wire or Single Cotton Covered plain H.C. Copper Wire. DIELECTRIC. Two layers of pure rubber for each core. Each layer to be at least .005 radial thickness. PROTECTIVE COVERING. Each core should be protected with a single cotton lapping. One core white and one-core red. Cotton braided and compounded black. Workshop finish. The twin cables shall then be twisted together. | ||