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).
Construction of three ignition coils with different winding types.
| Identifier | ExFiles\Box 69\1\ scan0302 | |
| Date | 27th January 1930 | |
| X8710. EFC. from Mr.Brock. 27.1.30. Here-with three ignition coils. All of these have been wound and built up similar to the three new ones you have already had, viz. core built up in paxolin tube and secondary wound on paxolin tube. One has a parallel secondary winding except for the last 6 or 7 layers which are tapered off very much. The other two are parallel wound throughout. I might add that the latter type are better as a manufacturing proposition and we would prefer this type providing results are as good. E.J.Brock. | ||