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).
Graph charting test results for six cars for a month ending in February 1923, possibly related to the Goshawk.
| Identifier | Morton\M7\ img073 | |
| Date | 14th February 1923 | |
| OF 6 CARS FOR MONTH ENDING FEB. 14.TH 1923. L TESTS & WORKS UNIT TEST. S, THE CURVES BEING AN PERIOD AS THE GOSHAWK. | ||