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).
Instruction sheet comparing leakage test results of different materials at various temperatures.
| Identifier | ExFiles\Box 69\1\ scan0120 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To__________________________________________________________________19__ Order No. PD 28 (2) Customer's No.____________________ degrees. Below are given some results obtained from the first cycle of temperature, and these are compared with similar results obtained on a recent batch of standard cases put through the production test; the figures being fairly representative of the Redmanol material. The new cases are assumed to have had exactly the same treatment in the moulding process as the standard cases. Ratio. (Megohms) | Temp. | Celoron M | Celoron S | Beetle Powder | Redmanol | | |-------|-----------|-----------|---------------|----------|----------| | 20 | 2,830 | 973 | 2,850 | 1,580 | 70.7 | | 40 | 2,740 | 191.7 | 959 | — | — | | 60 | 663 | 54.1 | 945 | — | — | | 80 | 72 | 16.5 | 270 | 69.1 | 3.1 | | 100 | 331 | 12.2 | 46.1 | — | — | These results show that, as regards leakage at various temperatures, all three materials are quite as good as Redmanol. It was observed Signed_____________________ Cont'd This Sheet must be filed on completion of the work. | ||