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 figures taken on three different types of car heater motors.
| Identifier | ExFiles\Box 137\2\ scan0078 | |
| Date | 11th May 1938 | |
| Rm{William Robotham - Chief Engineer}/Std.17/WH.11.5.38. TEST FIGURES TAKEN ON CAR HEATER MOTORS. (1) Clayton 'CC' type. Heater Volts. Heater Amps. Full on 12.2 1.6 1150 R.P.M. 6.5 1.13 (2) R.R.Heater, with British Thermostat Co.'s motor. Full on 11.5 1.4 1150 R.P.M. 6.62 .99 (3) R.R.Heater with Lucas Motor. Full on 11.7 1.88 1150 R.P.M. 9.9 1.6. | ||