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).
Improvements to ignition coil No.L.I.5 for fitting to 23-EX.
| Identifier | ExFiles\Box 69\2\ scan0001 | |
| Date | 20th January 1930 | |
| To RHC.{R. H. Coverley - Production Engineer} from EFC. c. Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} COPY X8712 EFC2/AD20.1.30. X. 87102 IGNITION COIL FOR 23-EX. Will you please arrange to have fitted to 23-EX, ignition coil No.L.I.5. which embodies several improvements in construction and general efficiency namely :- (1) Primary wound on Paxolin tube over the core thus obviating the use of the two copper securing rings now used. (2) Secondary wound on Paxolin tube over primary, giving a more rigid base and better winding. (3) Secondary insulated with two turns of waxed paper per layer the layers being shorter to avoid sparking over ends, on open circuit. (4) Coil impregnated when finished in paraffin wax. HEW EFC. | ||