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).
Graph showing test results for the effect of short circuit secondary turns on a coil under different loads.
| Identifier | ExFiles\Box 164\5\ img263 | |
| Date | 7th December 1936 guessed | |
| TESTS SHEWING THE EFFECT OF SHORT CCT SECONDARY TURNS TEST TAKEN WITH STD COIL & BALLAST STD. DISTRIBUTOR .55 MAKE RATIO 12 VOLTS SUPPLY H.T. OUTPUT TAKEN FROM DISTRIBUTOR (A) COIL D.72503 WITHOUT SHORT CCT SECONDARY TURNS (B) " " " WITH " " " " (C) " " " WITHOUT " " " " (D) " " " WITH " " " " 1 MEGOHM LOAD 1/2 MEGOHM LOAD Vertical Axis: SECONDARY VOLTS (KILO-VOLTS) Values: 12, 10, 8, 6, 4, 2, 0 Horizontal Axis: SPARKS/SEC. Values: 0, 50, 100, 150, 200, 250 Top Right Corner: 25 | ||