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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).
Test report on the new Dunlop Super Double Lift Jack, recommending its production due to successful testing.

Identifier  ExFiles\Box 48\1\  Scan051
Date  21th May 1930
  
*4124.
BY. {R.W. Bailey - Chief Engineer} From Hs {Lord Ernest Hives - Chair} /AJL.
C. to Mx. {John H Maddocks - Chief Proving Officer}

Hs {Lord Ernest Hives - Chair} /AJL.1/MJ.21.5.30.

DUNLOP SUPER DOUBLE LIFT JACKS.

Further to Hs {Lord Ernest Hives - Chair} /AJL.2/MJ.14.5.30, we have carried out a further test on the new type double lift Dunlop Sample Jack. This test consisted of jacking up one side of the front of a car, from under the road spring, from the lowest possible position to the highest (i.e. from a bare 20" wheel to a position high enough to allow a fully inflated tyre and wheel to be fitted). This test was carried out 25 times and the jack is in very good condition at the conclusion of the test. Jacking one side of the car up in this manner is a possibly/more severe test than jacking the whole of the front of the car from the centre, owing to the side load put upon the jack due to it working through the arc of a circle the centre of which is the point of contact of the wheel on the ground.

In view of the success of the tests and also because of the large percentage of failures on the present jack, will you please make arrangements for this new type of jack to come on to production as early as possible, subject to the slight alteration to the universal handle (demonstrated to MR. Carr on the 19th.) to prevent the pinion bush being damaged by the boss on the handle.

We must not send out any more of the old type jacks than is absolutely necessary.

Hs {Lord Ernest Hives - Chair} /AJL.
  
  


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