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).
Investigation into a modification for the Phantom III push button switch to address the breakage of the carbon contact pigtail.
| Identifier | ExFiles\Box 168a\2\ img357 | |
| Date | 20th September 1937 | |
| 0137. CHLPS To HY.{Tom Haldenby - Plant Engineer} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Ha. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Gow O.{Mr Oldham} M.{Mr Moon / Mr Moore} RHQ/amd.1/JWA.20.9.37. RE. FAILURE OF PHANTOM III PUSH BUTTON SWITCH DUE TO BREAKAGE OF CARBON CONTACT PIGTAIL. Having investigated the coiled pigtail carbon assembly which has been proposed for fitment to Phantom lll Switchboxes, we feel that this is quite an inexpensive but effective way of overcoming these breakages. There is just one point, however, and that being, the liability for the coiled connector to become entangled in the coil spring although the test report Rm{William Robotham - Chief Engineer}/HO.8/JH.10.9.37 proves no sign of fraying after 15,000 operations. We recommend this modification be adopted as soon as supplies of the new carbons can be obtained in view of the failures experienced in customers' hands. RHQ/J.{Mr Johnson W.M.} Smedley. | ||