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).
Research laboratory report on the effects of petrol, oil, and heat on electrical cables.
| Identifier | ExFiles\Box 165\1\ img017 | |
| Date | 15th March 1937 guessed | |
| THE JOSEPH LUCAS RESEARCH LABORATORIES PAGE 2. It was noticed that the ozone cracking did not occur evenly along the test sample, but only on the twist near the actual failure. Effect of Petrol. After soaking in petrol for 24 hours, the cable swelled to a diameter of 10 mm. Standard cable is similarly affected. Effect of Oil. The cable swelled to a diameter of 8 mm. after soaking in oil for 72 hours (Standard ditto). Stoving test. Both standard and special cables were unaffected up to temperatures of 100°C. for a period of 24 hours. Conclusions. The dielectric strength of this cable compares favourably with the present Lucas standard. The resistance to ozone properties is not nearly so good as the Lucas cable (time for failure >20 mins). From the nature of the ozone failures it seems to be due to some fault or possibly mechanical weaknesses in the outside layer, the remaining turns of the test sample, apart from where the failure took place, being unaffected. ---- RBSempf TW | ||