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).
Calculations for the resistance of an armature turn and corresponding wire size.
| Identifier | ExFiles\Box 35\4\ scan 037 | |
| Date | 1st July 1921 guessed | |
| -4- Contd. Resistance of one armature turn .0192 x .4 = __________ 58 = .001325 Length of armature turn = 10" approx. Resistance per 1000' = 1200 x .001325 = 1.59 w This agrees with proposed size of wire, viz. 14 S.W.G. (.080" dia.) at 20OC (1.62 w per 1000') Contd. | ||