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).
Comparison table of armature specifications for various motor types.
| Identifier | ExFiles\Box 61b\3\ scan0054 | |
| Date | 26th April 1917 | |
| MOTOR:- Lucas. A.510, C.A.V., R.R.45, R.R.17, R.R.24, Bosch, Bijur. ARMATURE. Contd. Row: Resistance of winding from com. seg. to com. seg. 90° away (ω) (cold) Data across columns: .00845, .00864, .0114, .0150, .0585 as measured. (one path in parallel with three in series = .0195. (all four paths in parallel)), .00952 Row: Weight of copper per composing winding.(lb). Data across columns: 1.660, 1.250, 1.500, 1.600, 1.006, 1.410 Row: Weight of armature complete except for nuts. (lb). Data across columns: 7 lbs. 10½ ozs., 6 ozs. 15 ozs., 11 lbs. 9 ozs., 11 lbs. 1 oz., 10 lbs. 10 ozs., 11 lbs., 11 lbs 4 ozs (handwritten) Row: Air Gap. (mm) (inches). Data across columns: .38 .015, .79 .031, .63 .025, .63 .025, .63 .025, .43 .017, .63 .025 Side Text: R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. | ||