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).
Graph of characteristic curves for cut-out operation with specific reference to the Bleriot PHI cut-out.
| Identifier | ExFiles\Box 48\3\ Scan163 | |
| Date | 6th December 1920 guessed | |
| CHARACTERISTIC CURVES OF CUT-OUT OPERATION. PWQ= Curve of spring tension. PR, TU, SQ are magnetic traction curves for various ampere turns. WITH PARTICULAR REFERENCE TO BLERIOT PHI CUT-OUT. P. T. S. OPEN. GAP. CLOSED. P. U. Q. V. {VIENNA} W. w. w¹. | ||