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).
Wiring diagram of a Bleriot PHI cutout.
| Identifier | ExFiles\Box 48\3\ Scan304 | |
| Date | 25th April 1923 guessed | |
| X.4215 - DIAGRAM OF BLERIOT PHI CUTOUT INSULATION AC MC R 110w. Sh. 150w Se X D- B- D+ 1 2 3 6 + - | ||