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).
Telegram about testing Goshawk coils, specifically the 'hedgehogg' core design and the effect of increased dimensions.
| Identifier | WestWitteringFiles\J\November1922\ Scan30 | |
| Date | 16th November 1922 | |
| To: Roycar Derby. Clarke goshawk coil test if hedgehogg the core is a definite advantage also test if any advantage in increased core section and coil lengths we propose cancelling hedgehogg at one end and giving extra length of core to facilitate connections we are | ||