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 for intensive heating, preliminary breakdown, and primary current consumption of a coil.
| Identifier | ExFiles\Box 164\5\ img074 | |
| Date | 17th August 1931 guessed | |
| -3- (6) Intensive heating tests. 4 hours 70 m.r. 700 r.p.m. 80°C. (a) Secondary resistance after test :- 7580 ohms. Corresponding temperature :- 137 °C. Primary current at end of test :- amperes Ambient temperature :- °C. Coil fails to spark 5.5mm gaps at this temperature. (b) Secondary resistance after test :- ohms. Corresponding temperature :- °C. Primary current at end of test :- amperes Ambient temperature :- °C. (7) Preliminary breakdown test. Test voltage on secondary = (8) Primary current consumption. speed. .55 m.r. Current (amperes) .70 m.r. 200 1.150 1.32 300 1.105 1.27 400 1.070 1.25 500 - - 600 1.025 1.215 700 - - 800 .915 1.175 1000 .850 1.100 1200 .770 1.035 1400 .715 .965 1600 .650 .90 1800 .595 .83 | ||