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).
The failure of a Phantom III push button switch, recommending a modification to the pigtail connection.
| Identifier | ExFiles\Box 168a\2\ img355 | |
| Date | 10th September 1937 | |
| To By.{R.W. Bailey - Chief Engineer} c. to Hs.{Lord Ernest Hives - Chair} c. to Hd.{Mr Hayward/Mr Huddy}(FOR DEPOT SHEET). 6139 KM/HC.S/JH.10.9.37. Re failure of Phantom III Push Button Switch, due to broken pigtail connection on the Carbon Contact. We have now carried out a test on a Push Button Switch using a carbon with a longer pigtail, enabling same to be slightly coiled. This switch was dismantled after completing 15,000 operations and on examination the pigtail was found to be 100% with no signs of fraying. We recommend that this modification be brought on production, and a retrospective action taken with regard to the existing switches. We have now rebuilt the switch and will carry out a prolonged test in order to ascertain the life of this longer pigtail. We recommend that this modification be carried out on all cars fitted with this type of switch on coming into Depot. RM{William Robotham - Chief Engineer}/RG.{Mr Rowledge} | ||