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).
Failure of heater motors and a design modification by Joseph Lucas Ltd.
| Identifier | ExFiles\Box 137\3\ scan0063 | |
| Date | 15th March 1939 | |
| 1158 To Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} BY/RD.1/B.15.3.39. HEATER MOTORS. We have taken up with Messrs. Joseph Lucas Ltd., the failure of two heater motors caused by the softening and collapse of the brush spring, and they informed us that they have already modified their design to provide a pigtail for this motor for the brush, which is brought out through the brush holder, and it will be sweated to the brush gear. BY/RD | ||