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 a field circuit, detailing its components and winding specifications.
| Identifier | ExFiles\Box 36\4\ scan 080 | |
| Date | 17th July 1920 | |
| RR 300 (120B) (SF 349 24-1-19) MP 200552 91130 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C Order No. P.A.2. Customer's No. Re X 30146 Date July 17th 1920. Field Circuit. There is one wound pole, on a laminated pole piece, which is screwed to the yoke from the outside by two cheese headed screws; a hollow in the yoke opposite, forming the other pole. The coil consists of two windings of black enamel insulated wire; the main field having 705 turns of .0345" dia. (Approx 20 S.W.G.) wire, with a resistance of 6.1w at 22°C. A control winding of 19 turns of wire, .064" dia. (16 S.W.G) with a resistance of .059w at 22°C. Signed Cont'd.{John DeLooze - Company Secretary} This Sheet must be filed on completion of the work. | ||