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).
Proposed modification to insulate the arm of a push-button switch to prevent short circuits.
| Identifier | ExFiles\Box 34\3\ Scan064 | |
| Date | 1st June 1920 | |
| X-2641. BY5/H.{Arthur M. Hanbury - Head Complaints} 1. 6. 20. EP.{G. Eric Platford - Chief Quality Engineer} c. EFC. c. H.R. c. Hs.{Lord Ernest Hives - Chair} -------- RE INSULATING THE ARM OF THE PUSH BUTTON SWITCH CARRYING THE BRUSHES FROM THE COVER. X-2641. Referring to EP{G. Eric Platford - Chief Quality Engineer}6/F.29.5.20. I think the whole trouble can be permanently cured by putting a small thimble to cover the nut which actually touches the cover, and causes short circuit. In addition to the foregoing, we are also trying red fibre in place of the wood contact piece. The two propositions together will make the job absolutely fool-proof, and in addition, the thimble referred to in the first place can be sent to owners so that they can push it over the nut and insulate the nut protectively, so that if the wooden contact piece does wear, the arm will only make the contact with the cover through a reliable insulator. BY.{R.W. Bailey - Chief Engineer} EFC JUN 1 RECEIVED. | ||