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).
Specification limits for the chemical analysis and hardness of a cast aluminium alloy timing gear used on the Lincoln Zephyr.
| Identifier | ExFiles\Box 127\2\ scan0066 | |
| Date | 9th October 1940 | |
| COPY RM{William Robotham - Chief Engineer} 1077 Material Test Laboratory HL/GLT.13/MB.9.10.40. re: Cast Aluminium Alloy Timing Gears as used on Lincoln Zephyr Herewith the specification limits for Chemical Analysis and hardness worked to on the production of this part Copper . . . . . . . . . . 6.0--8.0 % Silicon . . . . . . . . . 1.0--2.15% Iron . . . . . . . . . . . 1.0 % Maximum Zinc . . . . . . . . . . . 0.6 % " Magnesium . . . . . . . . 0.10 - 0.20 % Titanium.. . . . . . . . . 0.20Maximum Aluminium . . . . . . . . . Balance Other impurities . . . . .1.0 % " Brindell 70-90. HL/GLT. | ||