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 600 Megohm Grade electric cable.
| Identifier | ExFiles\Box 168b\2\ img082 | |
| Date | 23th October 1917 guessed | |
| ROLLS ROYCE LIMITED MATERIAL Electric Cable. 600 Megohm Grade SPECIFICATION NUMBER 257. (RR. Low Tension) TYPE OF CORE Single. CORE SIZE 70/36 OUTSIDE DIAMETER .235" CONDUCTOR High Conductivity Tinned Copper Wire DIELECTRIC One layer pure and two layers Vulcanizing Rubber. Both to be equal in quality to First Grade plantation rubber. The vulcanizing 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 Non-metallic Braiding. Paraffin waxed. | ||