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).
Instruction sheet with test results for a Blériot-Phi Cut-out, showing operational values under hot and cold conditions.
| Identifier | ExFiles\Box 48\3\ Scan178 | |
| Date | 31th December 1920 | |
| RR 360 (120B) (SF 349 24-1-19) MP 200552 X.4215 88264 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFC {E. Fowler Clarke - Electrical Engineer} Order No: 33 Customer's No.: 1 Re: XA215 31-XII-1920 Blériot-Phi Cut-out. Operation Cold. Battery Off. COLD | HOT Volts to cut-in: 13.1 | 14.2 Amperes " ": .184 | .1805 Ohms " ": 71.2 | 78.7 Amperes after cutting in: .115 | .112 Ohms: 112.0 | 127.0 Volts to cut-out: 12.2 | 12.3 Amperes " ": .0976 | .0976 Ohms: 125.0 | 126.0 Amperes after cutting-out: .161 | .156 Ohms: 76.0 | 78.8 (Cont'd) Signed This Sheet must be filed on completion of the work. | ||