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 the variation of primary current consumption and efficiency of magnetic field production in an induction coil for battery ignition.
| Identifier | ExFiles\Box 52\3\ Scan309 | |
| Date | 4th March 1920 | |
| PRIMARY GAP (INCHES) .045 .040 .035 .030 .025 .020 .015 .010 .005 .000 VARIATION OF PRIMARY CURRENT CONSUMPTION, CURRENT AT BREAK & EFFICIENCY OF MAGNETIC FIELD PRODUCTION WITH ALTERATION OF PRIMARY GAP IN INDUCTION COIL FOR BATTERY IGNITION CURRENT (AMPERES) EFFICIENCY RATIO PERIOD OF MAKE / TOTAL PERIOD A. {Mr Adams} CALCULATED AVERAGE CURRENT CONSUMPTION OF REMY 12 COIL ON RATIO BASE, ASSUMING CONSTANT VALUE OF BALLAST RESISTANCE. B. CALCULATED CURRENT AT BREAK DITTO. C. ONE TENTH SQUARED CURRENT AT BREAK DITTO, REPRESENTING STORED ENERGY OF MAGNETIC FIELD. D. {John DeLooze - Company Secretary} CALCULATED EFFICIENCY OF MAGNETIC FIELD PRODUCTION DITTO. E. {Mr Elliott - Chief Engineer} OBSERVED AVERAGE CURRENT CONSUMPTION OF REMY 12 COIL ON GAP BASE. F. {Mr Friese} DITTO FOR REMY 6 COIL. ROLLS-ROYCE, LIMITED PRINT ROOM. 4 MAR. 20 DERBY | ||