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).
Query on calculating the number of turns per coil for a Liberty dynamo based on its armature resistance measurements.
| Identifier | ExFiles\Box 37\2\ scan 076 | |
| Date | 15th June 1918 | |
| X 3306 To BY/HBC. from EFC. EFC4/T15.6.18. X. 3306 - LIBERTY DYNAMO The resistance of the Liberty dynamo armature from a commutator segment to a commutator segment 90° away is .401 ohms cold. The resistajce of all the coils of the armature in series will be four times this, namely, 1.604 ohms. Can you obtain from this the number of turns per coil ? EFC. | ||