Note discussing the Halford tappet, an aero engine tappet, and the chemical composition of Silchrome.
| Identifier | ExFiles\Box 173\4\ img187 | |
| Date | 1st January 1936 | |
| -4- Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} 5/KW.1.1.36. Jardine said the Halford tappet needs absolutely air free oil and turning the other way up. They have a very clever tappet for aero engines which works either way up of which I have a drawing and hopes of a sample. Silchrome made to - 20% Cr. {Mr Cra’ster / Mr Chichester} 2½% Ni. 0.7% C. 2% Si. 0.6% Mn. will stellite satisfactorily." Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} | ||
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).