. Electrical ignition. he coil will decay through the condenser. This suddendecay of the current and hence magnetic flux induces an high to cause a spark to jump across one of thespark plug points. For the magneto circuit this unit is con-nected as a closed circuit type, that is, when the interrupteris closed the terminals of armature-dte short circuited throughthe interrupter and a very feeble current is flowing throughthe primar?/- coil. If the interrupter opens the breaker pointsthen there will be a sudden rise of the current in the primarycoil which produces a similar tr
. Electrical ignition. he coil will decay through the condenser. This suddendecay of the current and hence magnetic flux induces an high to cause a spark to jump across one of thespark plug points. For the magneto circuit this unit is con-nected as a closed circuit type, that is, when the interrupteris closed the terminals of armature-dte short circuited throughthe interrupter and a very feeble current is flowing throughthe primar?/- coil. If the interrupter opens the breaker pointsthen there will be a sudden rise of the current in the primarycoil which produces a similar transient voltage in the second-ary as in case of the battery circuit. For convenience, let us call the period during whichthe interrupter is closed the first transient, and the per-iod beginning from the instant the interrupter opens thesecond transient, Figs. 33, 34, and 35 are the oscillograms of thetransient current in the various parts of the circuits, the Top curveJ tfrrrra+ure. » , Spark c Top curve. Prim & ry Co 17 ;J<4L<z •• } Cortd(Zr7S< currentBattom •Ca Bf = O0 /op Cur\r<2,^ In-f-errupt&r turnout-Bettor •• F?<zfares?ce 6,-0° 40 explanation of which is given under each picture. As to themathematical expressions for these transient currents seeappendix A under low tension magneto. The high-tension magnetos, are the most recent de-velopment in magneto design, and they are in general connectedas^fopen circuit^ type, binding the secondary coil on the mag-neto armature is an improvement over the low-tension magnetoin several ways, - first, it eliminates the primary windingand core, therefore eliminating the losses in these parts;second, the generation of energy in the secondary winding it-self by cutting the lines of force in the magnetic field addto the efficiency; and third, a high-tension magneto includesall the equipment necessary for ignition purposes and re-quires much smaller space for install
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