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).
Letter from Dunlop Rubber Co Ltd concerning the testing of Straight Side Tyres for noise.
| Identifier | ExFiles\Box 45\1\ Scan158 | |
| Date | 10th December 1920 | |
| By Appointment To H.M. The King. DUNLOP RUBBER CO LTD FOUNDERS OF THE PNEUMATIC TYRE INDUSTRY. TELEGRAMS: "DUNLOPS, BIRMINGHAM." TELEPHONE Nos. (6 LINES): ERDINGTON 261 TO 266. STATION: CASTLE BROMWICH (Mid. Ry.) GOODS: TO DUNLOP SIDINGS, CASTLE BROMWICH. NEAREST CAR ROUTE: ERDINGTON CAR FROM STEELHOUSE LANE TO FORT DUNLOP WORKS. REGISTERED OFFICES: DUNLOP HOUSE, 1, ALBANY STREET, LONDON, N.W.1 ALL COMMUNICATIONS TO BE ADDRESSED TO THE FIRM. FORT DUNLOP, ERDINGTON, BIRMINGHAM. PLEASE QUOTE REFERENCE Development. P/R.{Sir Henry Royce} Messrs Rolls Royce Limited, DERBY. December 10th 1920. Attention of Mr.E.W.Hives. Dear Sir, Re Testing of Straight Side Tyres for Noise Effect due to tread pattern - we have carried out a number of further tests with the assistance of your experimental car, and have been able to demonstrate quite definitely that the noise is very largely due to the trapping of air in the recesses in the centre of the pattern. We have sent the car back to you with two tyres on the rear wheels in which the traction tread pattern has been modified in such a way that we find that these tyres are as silent as we think any non-skid tread can well be, and further that there is no marked increase of noise when the running direction of the pattern is reversed. We shall be very glad to have your own views on these tyres at your earliest convenience, and in the meantime are preparing some more tyres in which the pattern will be properly moulded - those at present on the care are only experimental. When convenient to you, we should like to have the | ||