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).
Required co-efficient of expansion for Phantom push rods based on nickel content.
| Identifier | ExFiles\Box 17\6\ Scan043 | |
| Date | 22th May 1928 | |
| +7060 To ROY.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rml/LG22.5.28. PHANTOM PUSH RODS. X7060 X3035 Graph: Co-efficient of expansion. .00020 .00015 .00010 .00005 Invar 0 10 20 30 40 50 60 % NICKEL. We require some steel tube for the Phantom push rods having a co-efficient of expansion of about .000018. As will be seen from the attached curve this should be obtainable with a nickel content of either just over or just under 20%. The section of the rod will be the same as the present steel rod. Will you please let us know if tubes such as we require are obtainable. This matter is urgent. If not exactly, what is commercially obtainable. Hs{Lord Ernest Hives - Chair}/R m.{Mr Moon / Mr Moore} | ||