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).
Test report on the effects of oil immersion and heat on various electrical cables.
| Identifier | ExFiles\Box 168\1\ img113 | |
| Date | 23th May 1932 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 481-8-12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To: Cont'd Order No. Customer's No. Chemical Effects 100 Hours in Oil. 40/.0076 (Single core) Finish good, covering hardened but not penetrated. 20/.0076 Finish good, covering slightly hardened but not penetrated. 40/.0076 (Three core) Finish good. Covering very hard, and cracks when bent, covering not penetrated. This type of cable is very bad in both immersion tests. 70/.0076 Finish good, covering hardened but not penetrated. H.T. Flex. Insulation not swollen, absorbed .39 grm of oil. Heating Test 7 Hours with oven at 100°C Samples of the cables were placed in an oven for 7 hours, with the temperature maintained at 100°C. The cables after baking were bent through a circle of 1 inch diameter to see if the internal covering showed signs of cracking. The results were as follows - 40/.0076 Single Core. No signs of cracking. Finish remained very good. 40/.0076 Three Core " " " 70/.0076 " " " 20/.0076 " " " Signed: Bould This Sheet must be filed on completion of the work. | ||