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).
To Mr. Brock with instructions to wind a coil with a 22 Gauge primary and 18000 turn secondary.
| Identifier | ExFiles\Box 69\1\ scan0102 | |
| Date | 8th June 1928 | |
| X8710 To Mr. Brock. EFCS/T8.6.28. Will you please have this coil handed to you herewith wound with a 22 Gauge primary and 18000 turn secondary, like those you are now producing, and oblige. EFC. O/N.735. | ||