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).
Particulars of a resistance unit in parallel with the main switch coil, including dimensions, resistance, and material specifications.
| Identifier | ExFiles\Box 64\3\ scan0227 | |
| Date | 5th July 1926 | |
| X. 7650. EFC/T5.7.26. PARTICULARS OF RESISTANCE UNIT IN PARALLEL WITH MAIN SWITCH COIL. 27" 32 SWG. (.0108" dia.) Resistance approximately 10 ohms. "Glowray" wire. Temperature coefficient = .00023 per °C. . EFC. | ||