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).
Test results for a coil's primary and secondary windings, including resistance, impedance, and inductance.
| Identifier | ExFiles\Box 69\1\ scan0056 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 451-8.12.24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. (2) Customer's No. 19 Primary Resistance (18°C) = 2.35 ohms. Impedance (50~) = 3.76 ohms Inductance = .0092 henries Secondary Resistance (18°C) = 5285 ohms Impedance (50~) = 12280 ohms Inductance = 35.0 henries. The inductance figures for this coil approximate those for the old standard coil. Further tests of current consumption and sparking capabilities will be carried out when a convenient opportunity occurs to use the rig. Signed H.E.W. This Sheet must be filed on completion of the work. | ||