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 electrical component windings, circuits, and quantities.
| Identifier | ExFiles\Box 69\1\ scan0294 | |
| Date | 23th December 1929 guessed | |
| -2- (1) Continuity of windings :- OK (2) Quantities :- Primary resistance .92 ohms at 17 °C. Secondary " 4305 " " 17 " Primary impedance at 50 cycles. 3.29 " " Secondary -ditto- 13500 " " Primary inductance .0100 henries Secondary " 40.7 " (3) Open circuit test :- OK. sparks over ends with ballast cold. (4) Open secondary circuit primary current :- 1.10 amperes. Short " " " :- 1.14 amperes. (5) (a) Secondary resistance after test :- Not ohms. Corresponding temperature :- °C. Primary current at end of test :- observed. amperes. Ambient temperature :- °C. (b) Secondary resistance after test :- Not ohms. Corresponding temperature :- °C. Primary current at end of test :- observed. amperes. Ambient temperature :- °C. | ||