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).
Production test table for a combined main switch and auxiliary switch unit.
| Identifier | ExFiles\Box 64\4\ scan0205 | |
| Date | 11th March 1929 | |
| X765 PRODUCTION TEST TABLE of COMBINED MAIN SWITCH AND AUXILIARY SWITCH UNIT. II. MAIN SWITCH UNIT. Date. Unit Number. (1) Gap remarks. (2) Amperes To (3) Amperes + (4) Copper contact pressure. > 2 lbw. Remarks. 14-12-28 A OK 7.90 1.36 2 lbw with 2.10 amperes E.7.C's gaps arranged with carbon internal gap 12-12-28 B OK 7.80 1.40 " 4.00 " " 17-12-28 C OK 7.60 1.30 " " 3.30 " " 20-12-28 D OK 8.00 5.10 " " 6.30 " E.7.C's gaps slightly modified 7-1-29 E OK 7.90 1.62 " " 2.90 " " 27-2-29 E OK 7.90 2.05 " " 4.20 " R's gaps to LEC 2620 modified to E.F.C's instruction 6-3-29 F OK — 5.70 " " 7.3 " " " 11-3-29 D OK 8.00 5.60 " " 8.0 " " " 10.1.29. | ||