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).
Laboratory report on the chemical analysis of a non-ferrous alloy from two broken pistons.
| Identifier | ExFiles\Box 76\3\ scan0036 | |
| Date | 27th February 1918 | |
| ROLLS-ROYCE, LIMITED. L 658 No. 604a. LABORATORY REPORT ON NON-FERROUS ALLOY. To: Mr Hives Works Date: 27th Feb 1918 Re: Two pistons that broke on test alloy in the form of: drilling marked: B742 & B770 received at works on: - received by: laboratory on: 27th Feb CHEMICAL ANALYSIS. Sample: 742 Copper: 6.72 % Zinc: 1.8 % Tin: Trace % Iron: .49 % Silicon: .40 % Manganese: .12 % Magnesium: .30 % Sample: 770 Copper: 1.05 % Zinc: 2.5 % Tin: .06 % Iron: .62 % Silicon: .47 % Manganese: .26 % Magnesium: .26 % Remarks, etc. These pistons showed a very coarse fracture & are peculiar in that they are high in Zinc. The alloy is rather on the stiff side also owing to the relatively high Manganese & Magnesium. We have found that the above is a disadvantage for Pistons. Signature: H.F.P. | ||