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).
Comparison of Michelin and Dunlop jacks, outlining dissatisfaction with Dunlop models and specifying required ranges for 40/50 HP and 20 HP cars.
| Identifier | ExFiles\Box 48\1\ Scan008 | |
| Date | 17th April 1924 | |
| Y4174 To Roy. {Mr H. Royce - Buyer} From Hs. {Lord Ernest Hives - Chair} c. to BY. {R.W. Bailey - Chief Engineer} c. to Wd {Mr Wood / Mr Whitehead} /GEA. Hs {Lord Ernest Hives - Chair} 1/LG17.4.24. RE. DUNLOP JACKS. X391 Y4174 We have no complaint to make against Michelin Jacks. We have used them for years - they are very compact and easy to operate so therefore we consider it would be a mistake to depart from them on any slight question of costs. If an English maker would take a Michelin Jack and copy it in detail, this might overcome the difficulty of obtaining supplies of Michelin Jacks. The Dunlop Jacks are not good enough. On the 40/50 HP. car we want a range on the jack from 8" to 16" - we cannot get this with any of the Dunlop Jacks. As regards the 20 HP. we want a range from 7½" to 12½", - we cannot get this on the Dunlop Jack. There is one which has a range from 7" to 12½". The fact that the Dunlop Jacks have no extension adjustment, is a disadvantage, also they are harder to work, are not so compact and the handle is not so convenient. Hs. {Lord Ernest Hives - Chair} | ||