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).
Tests of 20/25 & 40/50 battery ignition condensers, comparing paraffin waxed paper with plain paper impregnated with wax after winding.
Identifier | ExFiles\Box 165\5\ img090 | |
Date | 15th May 1933 | |
86113 By/RD. From Hs{Lord Ernest Hives - Chair}/Wst. c. to E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Wst.4/MA.15.5.33. 20/25 & 40/50 BATTERY IGNITION CONDENSERS. We have been carrying out a number of tests in the laboratory during the last few days on the latest 20/25 condenser wound with paraffin waxed paper, and we have previously reported on several improvements we wish to be carried out on these condensers. We do not appear to be getting the consistency of capacity with temperature, that we obtained with the circular roll type condenser. The only difference we can see between these condensers at the moment is that in one case we used paraffin waxed paper and in the other ordinary plain white paper wax impregnated after winding. We have been assured by both Messrs. Lucas and the Telegraph Condensers Co.Ltd., that they have always obtained the best results with condensers using plain white paper afterwards wax impregnated when in position in the condenser. We have asked you to obtain for us some plain white paper as per our Hs{Lord Ernest Hives - Chair}/Wst.3/MA.15.5.33., and our experiments on the condenser wound with this plain white paper and afterwards wax impregnated will be proof as to whether this is causing the difference in results. The condensers now being built up on production are no better than the old standard varnished paper condensers in respect to variation of capacity with temperature and we attribute this to the impure impregnating wax used by the papers makers giving a poor dielectric constant although the wax may be an excellent insulator in itself. Hs{Lord Ernest Hives - Chair}/Wst. | ||