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).
Temperature and leakage tests on experimental ignition coil cases made from new moulding powders.
| Identifier | ExFiles\Box 69\1\ scan0119 | |
| Date | 6th July 1928 | |
| 238 (150 BKS.) (DS 461-8-12 24) MP 306975 X4079 X8710 ROLLS-ROYCE LTD. INSTRUCTIONS. To EFC Order No. PD 28 Customer's No. X 4079 Date July 6th 1928 Temperature - Leakage Tests on Experimental Coil Cases. Three ignition coil cases, made up from some new moulding powders, were submitted for test by the production department. The investigations were initiated with a view to obtaining a powder which was cheaper, and of British manufacture, but at the same time as good as our standard material, Redmanol. The moulding powders used were:- 1 Celoron. Grade M.{Mr Moon / Mr Moore} 2 Celoron. Grade S. 3 Beetle Powder. Each coil case was taken through two cycles of temperature, ranging from atmospheric to 100°C, the leakage current being measured at intervals of 20 centigrade. Signed Cont'd.{John DeLooze - Company Secretary} This Sheet must be filed on completion of the work. | ||