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).
Table of measurements and tolerances for main and auxiliary switch unit gaps.
| Identifier | ExFiles\Box 60\2\ Scan057 | |
| Date | 25th February 1932 | |
| 25. 2. 32. MAIN AND AUXILIARY SWITCH UNIT GAP TABLES. SCHEME OR UNIT :- .L MAIN SWITCH Position of Switch. Air gap at core centre. Core to Armature Stop. Copper gap (first blade to make). Carbon gap. Off .084+4 .090+5 -3 .062+4 .025+5 Carbons just in contact. .071+1 -3 .074+2 .040 0 Coppers just in contact. .047 -2 .045 0 0 Full on. .010 -2 0 0 0 Mutual gaps :- Full off .015+3 Full on .010+2 AUXILIARY SWITCH Position. Air gap at core Gap between pole face & min. airgap. Gap at Upper contact Gap at lower contact Off .060 .060 0 .017 Just making lower contact. .050 .048 .014 0 Full on. .010 -2 0 .070 0 Hs {Lord Ernest Hives - Chair} /wst. | ||