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).
Specification sheet for basic gaps on a Main and Auxiliary Switch Unit, version 2.
| Identifier | ExFiles\Box 64\4\ scan0145 | |
| Date | 19th December 1928 | |
| 19.12.28. MAIN AND AUXILIARY SWITCH UNIT BASIC GAPS. ETC:- VERSION 2. MAIN SWITCH. Armature stop. .006" Armature stop gap when coppers .025" are just in contact. Copper gap, carbons just in .020" contact. AUXILIARY SWITCH. Armature stop. .006" Armature stop gap when bottom .035" silver contacts just make. Top silver gap, carbons just .015" in contact. MUTUAL. Arm gap, both in fully off and .010" fully on positions. Carbon interval gap reckoned .015" at carbons. EFC. | ||