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).
Letter to British Insulated Cables Ltd. describing the method of testing for ozone on cables.
| Identifier | ExFiles\Box 61\1\ scan0317 | |
| Date | 15th August 1936 | |
| Y6110. Hs{Lord Ernest Hives - Chair}/Wst.S/JH. 15th August, 1936. Messrs. British Insulated Cables Ltd., Helsby, Nr. Warrington. Dear Sirs, In reply to your letter of the 14th instant, reference WKS/CW, our method of testing for ozone is to wind the cable two turns round a metal drum about 3" diameter, the drum being heated internally, so that the surface is maintained at a temperature of 80°C. The conductor of the cable is then connected to an ignition coil discharging across a sparking gap at 10,000 Wolts. Owing to the High frequency oscillatory nature of the spark discharge, the ozone is generated profusely and we find this extremely valueable and representative of the worst conditions obtaining on our engines. Yours faithfully, FOR ROLLS-ROYCE LTD. | ||