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 and measurements for a Main Switch Coil Discharge Resistance.
| Identifier | ExFiles\Box 64\4\ scan0139 | |
| Date | 18th December 1928 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 451-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To: EFC Order No. PD33 Customer's No. X7655 Main Switch Coil Discharge Resistance. is instructed to This unit should be wound with 22 turns, of 32 S.W.G., D.S.C., Eureka wire, giving a total length of 66.0 inches and an approximate resistance of 13.25 ohms. The first one was made in the experimental shop, only 20 turns of D.C.C. wire being got on. The measured resistance of this was 12.42 ohms at 15°C. In all other respects it was according to the drawing. Signed: C.A.P. This Sheet must be filed on completion of the work. | ||