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 showing gap measurements for the Silent Starter Main and Relay Switch Unit on model 9-EX.
| Identifier | ExFiles\Box 64\3\ scan0219 | |
| Date | 15th March 1926 | |
| /7650 15.3.26. SILENT STARTER MAIN AND RELAY SWITCH UNIT ON 9-EX. B Unit at present. Gaps on Contact. MAIN SWITCH. Position Armature to core gap. Copper gap. Carbon gap. -------------------------------------------------------------------- OFF. .065" .068" .063" Carbons making. .035" .025" 0 Coppers making. .020" 0 0 RELAY SWITCH UNIT. Position. Gap at upper contact. Gap between core and armature. Gap at lower contact Gap at carbon contact. --------------------------------------------------------------------------------------------------------------------- OFF. 0 .042" .050" .035" Carbons making. .014" .028"*2 .028" 0 ON. .028" .010" 0 .035" EFC. | ||