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).
Note on the utilisation of the Bleriot Phi Cut-out, cross-referencing to the Bleriot Dynamo.
| Identifier | ExFiles\Box 48\3\ Scan220 | |
| Date | 18th March 1921 | |
| X, 4215 . X.4215 - BLERIOT PHI CUT-OUT. 18.3.21. For full particulars of the utilisation of this cut-out with the Bleriot Dynamo and System, see under X.681 - Bleriot Dynamo. E.F.C. EFC. {E. Fowler Clarke - Electrical Engineer} | ||