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 Cast Aluminium Alloy Timing Gears used on the Lincoln Zephyr.
| Identifier | ExFiles\Box 136\1\ scan0329 | |
| Date | 9th October 1940 | |
| COPY RM{William Robotham - Chief Engineer} 1/5 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 - 1.5% Iron . . . . . . . . . . . 1.0 % Maximum Zinc . . . . . . . . . . . 0.6 % " Magnesium . . . . . . . . . 0.10 - 0.20 % Titanium.. . . . . . . . . 0.20 Maximum Aluminium . . . . . . . . . Balance Other impurities . . . . . .1.0 % " Brindell 70-90. Hl/GLT. | ||