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).
Test results and failure analysis of a coil component, detailing resistance, temperature, and current measurements.
| Identifier | ExFiles\Box 69\1\ scan0286 | |
| Date | 2nd January 1930 guessed | |
| -3- (6) (a) Secondary resistance after test :- 6050 ohms. Corresponding temperature :- 151 °C. Primary current at end of test :- 1.90 amperes. Ambient temperature :- 16 °C. (b) Secondary resistance after test :- 4950 ohms. Corresponding temperature :- 80 °C. Primary current at end of test :- 2.45 amperes. Ambient temperature :- 17 °C. (7) Coil failed after 2 hrs on this test. Fault found to be due to a short circuit on the secondary winding which was confirmed upon unwinding, the short circuit having occurred at the end of the 2nd layer. (8) Speed. Current (amperes) 200 300 400 500 600 700 900 1200 1500 1800 | ||