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).
Specifications for a coil, detailing insulation, dimensions, and connection.
| Identifier | ExFiles\Box 52\3\ Scan261 | |
| Date | 3rd November 1917 guessed | |
| Contd. -2- Top of coil insulated with three layers of Empire Cloth .010 thick. Overall dia: 2 5/32" The inside end of Sec: taken through flange to earth for connection. | ||