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).
Technical specification and serviceability report for the Michelin 'Fast' Jack supplied with 40/50 HP chassis.
| Identifier | ExFiles\Box 26\3\ Scan036 | |
| Date | 9th February 1927 | |
| TO BY.{R.W. Bailey - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} X391 Hs{Lord Ernest Hives - Chair}4/LG9.2.27. MICHELIN 'FAST' JACK. Supplied as std. equipment on 40/50 HP. chassis. Minimum height ................... 8.5" Hand adjustable initial lift ...... 4.0" Mechanical lift .................... 5.5" Maximum height ..................... 18.0" Load ............................. 2000 kgs. This jack fails in the following instances :- (1) Will not go under the front axle. (2) Will not lift the rear of car fitted with Hartford shock absorbers (present production) from the base rim to fit a new inflated tyre,(if jacked up from the axle tube). It is serviceable as below :- (1) Will lift the front of a car if jacked up from under the spring, from the base rim to allow a new inflated tyre to be fitted leaving only .75" between the tyre and a level road. (2) Will lift the rear of a car fitted with hydraulic shock absorbers from the base rim to allow a new inflated tyre to be fitted leaving only .25" between the tyre and a level road. (3) Will lift the rear of a car fitted with Hartford shock absorbers from the base rim to allow a new inflated tyre to be fitted leaving only .45" between the tyre and a level road if the car is jacked up from the Hartford shock absorber bracket. The addition of packing under the Michelin 'Fast' jack gives no assistance whatever. The adjustable initial lift provided on the Jack gives the necessary range required with 2" adjustment in hand, allowing the full mechanical lift to be used in every possible case. The maximum jack height required is 16" - the maximum obtainable is 18", made up as follows :- contd :- | ||