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).
Instructions for modifying the resistance values of a component.
| Identifier | ExFiles\Box 168b\3\ img188 | |
| Date | 26th February 1929 | |
| ROLLS-ROYCE LTD. INSTRUCTIONS X7535P To Insp^r Order No. Inst^n Customer's No. X 7535 R.{Sir Henry Royce} T. Ea. RRBDH/12. 12. it says 3.4. This left as new an insul'd 17.000 ohms now is to be reduced to constant external resistance of 1.400 ohms but may be increased with addition of plugs until a total resistance is obtained. A High Rate E'change it with a series to an external resistance of 1000 parallel resistances = 1071 one of 194 ohms = 2.8 ohms " " 40 " = 7.0 " " " 70 " = 14.0 " " " 90 " = 18.0 " Note that these figures show parallel resistances Signed C.F. This Sheet must be filed on completion of the work. | ||