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).
Observations from a road test of an automatic switch, detailing voltage and amperage readings under different conditions.
| Identifier | ExFiles\Box 59\1\ Scan122 | |
| Date | 9th March 1927 | |
| RR 238 (150 BKS.) (SH57.29-6-20.) MP 224358 X4008 ROLLS-ROYCE LTD. INSTRUCTIONS. To: E F C Order No.: PC 125 Customer's No.: X4008 Mar 9th 1927 Road Test of Automatic Switch. Some observations were made on the operation, under road conditions, of the automatic switch fitted to 8 EX. A voltmeter, connected to the inspection lamp terminals, read approximately the battery terminal voltage; the ampere output being measured by the chassis ammeter. The results, and the conditions under which obtained, were as follows:- Car standing. After a short run (the dash on the driving side was just warm) the switch operated at 16.0 volts. Car running. In a warmed up condition (Engine 80°C) 1 Switch operated at 15.8 volts. Cutput reduced from 7.0 to 4.8 amperes. 2 After further running (Engine 85°C, dash (Cont'd) Signed This Sheet must be filed on completion of the work. | ||