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 Electric Cable, Workshop Twin Flex.
| Identifier | ExFiles\Box 168b\2\ img098 | |
| Date | 30th November 1922 | |
| ROLLS ROYCE LIMITED MATERIAL: Electric Cable. SPECIFICATION NUMBER: 263. (Workshop Twin Flex) 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. | ||