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 the winding specifications of a Field Circuit and an Armature Circuit.
| Identifier | ExFiles\Box 36\4\ scan 081 | |
| Date | 17th July 1920 | |
| RR 300 (120B) (SF 349 24-1-19) MP 200552 91131 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No. P.A.2. Customer's No. Re X 30146 July. 17th 1920 Field Circuit (Cont'd.{John DeLooze - Company Secretary}). The whole are bound together with empire tape, .025" thick, with presspahn packing on the inside, .010" in thickness. Armature Circuit. A progressive lap. with a pitch of 15 (1-16) in slots, consisting of 30 coils arranged 1 coil per slot, there being 30 slots and commutator bars. Each coil has 11 turns of double silk covered wire, .0489" dia. (18 S.W.G.). giving a total armature resistance of .45 ohm at 22°C. There are 660 Signed Cont'd.{John DeLooze - Company Secretary} This Sheet must be filed on completion of the work. | ||