By force of magnetic attraction it draws the hammer (J)  towards it, and thus separates the two platinum points at (H).  This separation interrupts the flow of the current, the core  consequently loses its magnetism, and the hammer (J) returns  by force of its spring (D) to its former position. Contact at  (H) is thus restored, current passes as before in the primary,  the core becomes again magnetised, and this cycle of events is  repeated automatically as often as the succession of’ make ‘  and ‘ break’ at (H) will allow. The alternative path (dd) to  the condenser (ee) will be dealt with later in reference to the  suddenness of the break.

The secondary winding, which consists of many thousands  of yards of very fine insulated copper wire, is not shewn in  Fig. 41, but its position is within the bobbin (KK), and its  endings are seen emerging at (FF), from which points con-  nection is made to the X-ray tube.

Following the laws of induction, at each make of the  primary current a momentary current is set up or induced  in the secondary circuit in a direction opposite to that in  the primary ; and at each break of the primary a momentary  current is induced in the secondary in the same direction  as the primary.

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