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 of road rolling resistance tests, plotting inflation pressure against distance rolled for two tyre sizes.
| Identifier | ExFiles\Box 53\2\ Scan257 | |
| Date | 4th October 1926 guessed | |
| DUNLOP RUBBER Co. LTD., BIRMINGHAM. SKETCHED BY.{R.W. Bailey - Chief Engineer} APPROVED BY.{R.W. Bailey - Chief Engineer} MILL. DATE. DEPARTMENT. RECORD NUMBER. DISTANCE ROLLED FROM REST. (YDS.). INFLATION PRESSURE (lbs. per sq. in.). 33x6.75 TYRES. 33x5 TYRES. ROAD ROLLING RESISTANCE TESTS. FIG. 2. A.G. THORNTON LTD MANCHESTER. | ||