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 on a Jaeger Speedometer Type 6183, detailing its accuracy at various RPMs.
| Identifier | ExFiles\Box 165\4\ img022 | |
| Date | 12th July 1928 | |
| X.4665 12.7.28. JAEGER SPEEDOMETER TYPE 6183. No. 516501. Reading is unaffected by temperature. Reading is either 21.0 or 22.0 (won't stay between) at 600 r.p.m. Reading is consistently 43.9 m.p.h. at 1200 r.p.m. To be correct instrument should read 42.5 m.p.h. at 1200 r.p.m., so it is 3% high. EFC. | ||