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).
Modification to a jack, replacing a hardened steel washer with a phosphor bronze one to prevent failure.
| Identifier | ExFiles\Box 48\1\ Scan021 | |
| Date | 4th January 1927 | |
| Hs. {Lord Ernest Hives - Chair} BY6/H.4.1.27. JACK. Colonel Matthew has come over to submit a jack which has been modified to overcome the trouble experienced during his last visit. The trouble was not that the screw of the jack bent, but that it tended to keel over sideways, throwing a load on to the hardened washer which was called upon to support the screwed portion, with the result that the hardened washer cut into the thread and destroyed the face of it, making it difficult to rotate. The hardened washer which caused the trouble has been replaced by a phosphor bronze washer, and the jack which is being submitted to you with a phosphor bronze washer, has been at the Daimler and Lanchester works, having lifted the 12-cylinder Daimler. In addition, every effort has been made by the Daimler Company to make it fail. A second jack with the old steel washer at the top, with all the parts loose, is also available in my office, for dismantling purposes, to show the method of operation Will you kindly send someone along for the two jacks. BY. {R.W. Bailey - Chief Engineer} [Handwritten text at top of page]: X4124 [Handwritten text in left margin]: S. J-3-1-27 | ||