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).
Sketch showing the difference in spoke drilling for Dunlop and American built wire wheel rims.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page066 | |
| Date | 17th January 1919 guessed | |
| Sketch shows the difference in drilling rims, for spokes. < x > Dunlop Wheel. The distance marked thus X is considerably greater in the American built wire wheels. American Wheel. Inside part of rim. F.7. | ||