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).
Test results for Bleriot Phi Cutouts under cold operating conditions.
| Identifier | ExFiles\Box 48\3\ Scan294 | |
| Date | 4th January 1921 | |
| X.4215. BLERIOT PHI CUTOUTS (COLD) Battery disconnected. Cold operation. Cold de-operation. Battery connected. Cold deoperation. Remarks | Cut-out number. | Volts. | Amperes before. | Amperes after. | Volts. | Amperes before. | Amperes after. | Volts. | Shunt amps. | Reverse series amps. | Remarks (Remarks for 38659) | 38659 | 12.8 | .20 | | | | | | | | Vibrates at cutting in point at maker's setting. Test bed GoshawkAero EngineCodename for 20HP Car / Aero Engine after KestrelAero Engine Pass | 38660 | 12.5 | .180 | .117 | 11.9 | .110 | .170 | 12.55 | .115 | 1.2 | After RR adjustment More series turns Pass | 38681 | 13.0 | .180 | .110 | 12.0 | .100 | .160 | 12.9 | .105 | .2 | After RR adjustment [Vertically handwritten in column] 6666 [Handwritten at bottom] 4.1.21. [Printed at bottom left] R. {Sir Henry Royce} 235A. (100) S.H. 783. 10-12-30. G 2547 | ||