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).
Instructions and specifications for an EAC Push Button Switch, including gap and limit values.
| Identifier | ExFiles\Box 64\3\ scan0260 | |
| Date | 19th November 1924 | |
| ROLLS-ROYCE LTD. INSTRUCTIONS. To: E F C Order No.: PC 89 Customer's No.: X 8651 EAC Push Button Switch. B. The gaps and limits decided upon for the above type of switch are as follows:- Position | Carbon Gap | Copper Gap | Button Depression --- | --- | --- | --- Off | .063" +12 -13 | .090" +15 -15 | 0 Carbons in contact | 0 | .040" +5 -5 | .029" +6 -6 Coppers in contact | 0 | 0 | .052" +9 -9 On this particular switch the carbon contacts need adjusting so as to meet earlier. It was also noticed that one of the side stops comes into operation before the other, resulting in the lever tilting sideways slightly, after coming into contact with the earlier stop. Signed: C.A.P. | ||