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 tests on the rolling resistance of tyres.
| Identifier | ExFiles\Box 45\1\ Scan351 | |
| Date | 10th November 1925 | |
| Telegraphic Address. "DUNLOPS, BIRMINGHAM" Telephone No. BIRMINGHAM CENTRAL 4108. PRIVATE BRANCH EXCHANGE. 25 LINES. Registered Offices. DUNLOP HOUSE, I, ALBANY ST LONDON, N.W.I. BY APPOINTMENT DUNLOP RUBBER CO LTD Founders of the Pneumatic Tyre Industry FORT DUNLOP, ERDINGTON, BIRMINGHAM. STATION: CASTLE BROMWICH, (MID. RY.) GOODS: TO DUNLOP SIDINGS, CASTLE BROMWICH CAR ROUTE: TYBURN ROAD FROM STEELHOUSE LANE. TO FORT DUNLOP WORKS, CAR 63. WHEN REPLYING PLEASE QUOTE ON BOTH LETTER & ENVELOPE Research Department. ALL COMMUNICATIONS TO BE ADDRESSED TO THE FIRM Messrs.Rolls Royce, Ltd. DERBY. 10 November 1925. Your ref. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}1/LG. Dear Sirs, Attention of Mr.Robotham, Expl:Dept:. Rolling Resistance of Tyres. In reply to yours of the 30th., ult. we give you a chart showing how rolling resistance varies with temperature and with inflation pressure. We ought to mention that the tests were made on an obsolete type of tyre, and by means of rather insensitive machines. The absolute values are therefore not to be taken too literally, though the relative values are quite reliable. We are having a machine specially constructed for this type of work, and shall be able to give you absolute values with a fair degree of accuracy. On the questions of tread pattern, and size of tyre, we are making some tests on a rough temporary machine, and will report again in a few days. We acknowledge receipt of the six 33 x 5 tyres with various tread design, etc. Yours faithfully, AHealey. for DUNLOP RUBBER CO.LTD. | ||