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).
Performance test results for a heater control switch from the British Thermostat Co.
| Identifier | ExFiles\Box 137\2\ scan0022 | |
| Date | 22th December 1937 | |
| 12-7 EWS/JF MEMORANDUM Report dated 22nd. December, 1937. From RESEARCH DEPT. To HEATER CONTROL SWITCH FROM BRIT.THERMOSTAT.CO. The switch was connected in circuit with a standard Klaxon 12 volt. motor and C.C. type car heater fan. The effect of the various position of the control are tabulated below:- | Position | Volts. | Amps. | Watts. | R.P.M. | |----------|--------|-------|--------|--------| | Off | - | - | - | - | | On | 12.0 | 1.2 | 14.4 | 2,830 | | 2 | 11.25 | 1.15 | 12.95 | 2,550 | | 4 | 10.0 | 1.1 | 11.0 | 2,370 | | 6 | 9.2 | 1.08 | 9.95 | 2,100 | | 8 | 8.25 | 1.0 | 8.25 | 1,870 | | Low | 7.50 | 0.97 | 7.275 | 1,600 | * Nos. refer to the second, fourth, sixth etc., "long stroke" on control dial. R = V/c | ||