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).
Recommendation to substitute a mild steel armature for a Duralumin one in the Starter Motor Main Switch due to supply issues.
| Identifier | ExFiles\Box 168a\2\ img342 | |
| Date | 9th July 1937 | |
| 6139 To By/RD. from Rm{William Robotham - Chief Engineer}/Wst. Rm{William Robotham - Chief Engineer}/Wst.17/AP.9.7.37 Starter Motor Main Switch. We have now tested the carbon contact armature made in mild steel which we were asked to test, in view of the fact that Duralumin ones were very difficult to obtain. The switch fitted up with this steel armature has been tested to our specification with satisfactory results. We therefore recommend the substitution of this steel armature in place of the Duralumin one. Rm{William Robotham - Chief Engineer}/Wst. | ||