Letter to Dunlop requesting updated figures on the increase in radius of tyres at various speeds.
| Identifier | ExFiles\Box 157\3\ scan0131 | |
| Date | 13th March 1941 | |
| 1332 13th March, 1941. Rm. {William Robotham - Chief Engineer} 5/ET. A. {Mr Adams} HEALEY, Esq., Dunlop Rubber Co. Ltd., Fort Dunlop, Erdington, BIRMINGHAM. Dear Healey, On 25th June 1925 you sent us some figures showing the increase in radius of 33 x 5 tyres at speeds from 10 to 90 M.P.H. You will appreciate that the accuracy of rev-counters and speedometers is dependent upon the radius of the tyres, and I should be much indebted to you if you could let me have similar figures for up to date 6 1/2 x 16 6 ply and 4 ply tyres. I apologise for troubling you at the present time and realise that you may have difficulty in obtaining the figures. Yours sincerely, | ||
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).