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).
Suggested specification for the electrical properties of Seekay Wax R.93 C, provided by Imperial Chemical Industries Limited.
| Identifier | ExFiles\Box 164\5\ img236 | |
| Date | 26th February 1935 guessed | |
| IMPERIAL CHEMICAL INDUSTRIES LIMITED. General Chemical Group. SEEKAY WAX R.93 C. Suggested Specification for Electrical Properties. (1) PERMITTIVITY. Conditions of Test. Specimen to be prepared by melting on the surface of mercury and allowed to cool, in such a manner that the temperature falls from 100°C. to 85°C. in between 5 and 10 minutes. The measurement to be made @ 50 cycles/second at 25°C., a guard ring being used to eliminate edge capacity. Value Above 4.8 | ||