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, 600 Megohm grade electric cable.
| Identifier | ExFiles\Box 168b\2\ img077 | |
| Date | 27th September 1922 guessed | |
| ROLLS ROYCE LIMITED. MATERIAL. Electric Cable. 600 Megohm Grade. SPECIFICATION NUMBER. 252 TYPE OF CORE. Single. CORE SIZE. 84/25 OUTSIDE DIAMETER. .425 maximum CONDUCTOR. High Conductivity Tinned Copper Wire. DIELECTRIC. One layer pure rubber and two layers Vulcanising Rubber. The rubber in each case shall be equal in quality to First Grade Plantation Rubber. Total thickness of dielectric not less than .050". The Vulcanising Rubber shall contain at least 40% Pure Rubber. Mineral fillers only shall be used. Proportion by weight of sulphur shall not exceed 2.5%. PROTECTIVE COVERING. Oil resisting varnished cambric tape spirally lapped. Cotton braided and compounded. | ||