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).
Instructions detailing the pre-conditions required before conducting a vehicle test.
| Identifier | ExFiles\Box 161\1\ scan0222 | |
| Date | 10th September 1938 guessed | |
| 3. BEFORE MAKING THIS TEST, THE VEHICLE SHOULD HAVE ATTAINED ITS WORKING TEMPERATURE; THE ROAD MUST BE LEVEL AND THERE MUST BE NO WIND. SINCE THIS IS AN APPROXIMATE FORMULA ONLY, THE SPEED DIFFERENCE BETWEEN V1 AND V2 SHOULD NOT EXCEED 12 M.P.H. | ||