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).
Adjustments and gap specifications for an automatic switch and sequence silent starter.
| Identifier | ExFiles\Box 64\3\ scan0224 | |
| Date | 15th June 1926 | |
| X2652 BY/RD5/ML15.6.26. C. EFC. E.A.C. Vll. AUTOMATIC SWITCH. SEQUENCE SILENT STARTER. I have received from EFC. a revised table of gaps for this switch and they do not agree with the gaps shewn on the arrangement drawing D.71096 but it is a simple matter to adjust the switch to them, the first one having already been altered. (1) MAIN SWITCH UNIT. Bend tabs on D.70646 stop a little lower to adjust the off position. (2) RELAY UNIT. Slightly reduce lengths of D.70668 - Pedestals to adjust the off position. The gaps to be to the following table:- SWITCH UNIT. Position. | Gap between pole core and armature stop. | Copper gap. | Carbon gap. --- | --- | --- | --- Off. | .057" ±5 | .065 ±5 | .062 ±10 Carbons just making. | .032" ±5 | .020+10 -5 | 0 Coppers in contact. | .020" | 0 | 0 (Cont'd) | ||