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).
Photograph of an engine mounted on a test rig, with a focus on the instrumentation.
| Identifier | ExFiles\Box 165\4\ img146 | |
| Date | 18th February 1932 guessed | |
| Tachometer Gauge: Main dial reads 0-2000 R.P.M. Inner dial reads 0-14 (likely x1000) R.P.M. | ||