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 600 Megohm Grade, metal braided electric cable.
| Identifier | ExFiles\Box 168b\2\ img076 | |
| Date | 28th June 1922 guessed | |
| ROLLS ROYCE LIMITED. MATERIAL. Electric Cable. 600 Megohm Grade. SPECIFICATION NUMBER. 251. Metal Braided. TYPE OF CORE. Single. CORE SIZE. 70/36. OUTSIDE DIAMETER. .225" CONDUCTOR. High Conductivity Tinned Copper Wire. DIELECTRIC. One layer pure rubber and two layers vulcanising rubber, both to be equal in quality to FIRST GRADE PLANTATION RUBBER. The vulcanising 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. Oil Resisting varnished cambric tape lapped spirally. Protected overall with a braid of 36 SWG. Tinned Copper Wire. | ||