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).
Technical specifications for an auto switch.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan001 | |
| Date | 1st December 1927 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. E.{Mr Elliott - Chief Engineer} ORIGINAL EFC4/T1.12.27. RE AUTO SWITCH. X4008 In the above connection the following information may be useful :- Maximum gap of contact points (measured normally to surfaces) .050" at screw stop. Maximum gap at lever stop on core .037". The spring used is of slightly stronger rating than the cutout spring equivalent to the removal of two turns of that spring, but with the same uncompressed length. The shunt coil winding is exactly as the shunt coil winding of the cutout. The resistance winding consists of 18-1/2 ft. of 26 SWG. D.C.C. Eureka (not 22 SWG. as erroneously stated in one of our previous reports). EFC. | ||