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 report for an A.T. speedometer removed from chassis 14-EX.
| Identifier | ExFiles\Box 50\4\ Scan151 | |
| Date | 17th November 1927 | |
| X4308 EFC {E. Fowler Clarke - Electrical Engineer} /T17.11.27. A.T. SPEEDOMETER. X.4308 No 1728 Grouped instrument A.T. speedometer belonging to chassis 14-EX has been removed for test in the laboratory previous to a long run. At a speed of 603 r.p.m. at a temperature of 18°C the m.p.h. indicated were 44.7. After the instrument has run for a considerable time on the car it is to be re-tested to see if any loss of magnetism of the permanent magnets has occurred. It was also noted to read 86.9 m.p.h. at 1206 r.p.m. EFC. {E. Fowler Clarke - Electrical Engineer} 1728 | ||