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).
Engine on a test bed connected to a large Heenan & Froude dynamometer.
| Identifier | ExFiles\Box 173\2\ img244 | |
| Date | 27th February 1934 guessed | |
| HEENAN & FROUDE LTD WORCESTER. ENGLAND 2 85158 | ||