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 a switch, detailing voltage, current, and performance under varying temperature conditions.
| Identifier | ExFiles\Box 59\1\ Scan123 | |
| Date | 29th June 1920 | |
| RR 238 (150 BKS.) (SH57. 29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. 19 To Order No. PC 125 (2) Customer's No. about 30°c by touch):- Switch operated at 16.1 volts Output reduced from 10.0 to 5.0 ampers. 3. After still further running. (engine 85°c) Switch operated at 16.1 volts Output reduced from 10.0 to 5.0 ampers. After operation of the switch, the voltage rose to a maximum of 16.6 volts, and over a wide range of car speed, varied only between 16.4 and 16.6 volts with corresponding outputs of 5.0 to 6.0 ampers indicating the flat nature of the dynamo output characteristic with the field resistance inserted. The operation of the switch at all times and in all respects appeared to be quite definite and satisfactory. Signed CAP. This Sheet must be filed on completion of the work. | ||