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).
American Bosch battery ignition, referencing a photostat copy of a Delco coil for comparison.
| Identifier | WestWitteringFiles\P\October1926-November1926\ Scan108 | |
| Date | 11th November 1926 | |
| To R.{Sir Henry Royce} from EFC. c. to RJ. EFC1/T11.11.26. RE AMERICAN BOSCH BATTERY IGNITION. X4275 X4284 Further to our EPC2/T8.11.26, herewith we send you photostat copy of the Delco coil which is constructed on somewhat similar lines to the American Bosch coil which we have for experiment, i.e. it has the central high tension and the external primary. EFC. | ||