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).
Piston troubles, annealing processes, and a special 'Nelson' type piston.
| Identifier | ExFiles\Box 142\2\ scan0051 | |
| Date | 4th July 1925 | |
| - 3 - and on which the only attention required on test is to ease the hard spots which show up after running, and which will not necessarily be consistent in the same place. I should also like to draw Mr. Swift's attention to the Brinell test and to the annealing, which, as previously reported, Springfield claim has helped them considerably in overcoming their piston troubles, both as regards manufacture and obtaining results. Should you have any comments or further enquiries you would like to obtain from Springfield, I shall be glad if you will let me know, so that I can take the matter up with them further. I do not think we can look upon the fact that Springfield are entirely free from piston troubles. On each of my inspection visits, there has been the contention of pistons not giving satisfactory results. Such points, have, however, been fully appreciated, and they have certainly gone into the trouble very thoroughly. I also note they are now pushing us for a report of some special "Nelson" type pistons, which is evidently a recent American invention and assists in controlling the size of the aluminium piston by means of steel struts which have approximately the same coefficient of expansion as the cast iron cylinder as referred to in their report to CJ, reference Cyl/W62623, copy of which was sent to Hs.{Lord Ernest Hives - Chair} under cover of memo BJ/Fy9/D4.7.25. I take it this is a matter which Hs.{Lord Ernest Hives - Chair} will take up with R.{Sir Henry Royce} EP.{G. Eric Platford - Chief Quality Engineer} | ||