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).
Issues with the Phantom III and Wraith horn button and proposing a modified design.
| Identifier | ExFiles\Box 166\9\ img099 | |
| Date | 4th June 1937 | |
| To E.{Mr Elliott - Chief Engineer} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} c. By.{R.W. Bailey - Chief Engineer} c. Da.{Bernard Day - Chassis Design} c. Ev.{Ivan Evernden - coachwork} 6066 Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}6/AP.4.6.37 PH.III. AND WRAITH HORN BUTTON The present standard horn button is liable to rattle and also produces a sharp metallic noise when operated. The rattle is due to the button not resting on all four set screws in the off position, so that it can readily be rocked by vibration of the steering column. The use of three, instead of four screws would overcome this objection but would not quieten the operation of the button. The ebonite button to RR.sch.929, which we have tried, is not a complete cure of the noisy operation and would be difficult to engrave. We suggest the modified horn button shewn on the attached Rm.{William Robotham - Chief Engineer}389 in which the off stop consists of four rubber rings. We have ascertained that the four internal lips on the control quadrant can be die cast and that the four flanges on the inner dome can be formed by shearing and pressings. Will you please let us know whether you approve of this button. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} Prints attached to E.{Mr Elliott - Chief Engineer} and By's copies. | ||