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).
Gap measurements and button depression for a push-button switch.
| Identifier | ExFiles\Box 64\3\ scan0262 | |
| Date | 14th January 1925 | |
| X8651 To EFC. BY/RD/ML14. 1. 25. X.8651 - PUSH BUTTON SWITCH. Referring to your EFC2/T20. 11. 24. we suggest that the figures for the various gaps should be given as shown hereunder as we think it is almost impossible to provide for those as requested in your memo:- Position. Carbon Gap. Copper Gap. Button Depression. Off. .074+12 .092+15 .026. O -11. -15. Carbons in Contact. - .028+5 .064. .038 O -5. Coppers in Contact. - - .081+9 .055 +9 O.{Mr Oldham} -9. -9 The explanation of the switch in the "off" position and the button having a depression of .026 is that the button itself has a spring which lifts is quite clear of the Armature thus allowing the Armature to come right up to the stops provided for it. BY/RD. RECEIVED Hs{Lord Ernest Hives - Chair} 14 JAN 1925 | ||