. Radiography, x-ray therapeutics and radium therapy . Fig. 8.—Induction coil. (Newtou and Wright.) T (Fig. 9) represents the iron core, P the primary or thick copperwinding, P and T together forming the electro-magnet. SS is the thin or secondary winding, which in nearly all modern largecoils is now wound in a number of separate flat sections from end to end,each section insulated from the next by a partition of some insulatingmaterial, the sections being joined together alternately by their inner and. Fig. 9.—Flan of -winding of coil, primary, secondary, and connectionto condenser and break.
. Radiography, x-ray therapeutics and radium therapy . Fig. 8.—Induction coil. (Newtou and Wright.) T (Fig. 9) represents the iron core, P the primary or thick copperwinding, P and T together forming the electro-magnet. SS is the thin or secondary winding, which in nearly all modern largecoils is now wound in a number of separate flat sections from end to end,each section insulated from the next by a partition of some insulatingmaterial, the sections being joined together alternately by their inner and. Fig. 9.—Flan of -winding of coil, primary, secondary, and connectionto condenser and break. outer windings, so as to form one continuous helix the whole length ofthe coil. Between the secondary SS and the primary winding PP is the insulatingor primary tube, not shown in the diagram. B represents the simplest pattern of contact breaker. H is a piece of soft iron carried on a stifi brass spring, which is pulledtowards the magnet T whenever the latter is magnetised. B is a pair of platinum-tipped contacts, the front piece attached tothe brass spring and iron pole piece H, the back one brazed to an adjoiningscrew d, working in a collar h, so that the distance between the platinumtips can readily be adjusted. The current is passed from the positive pole of battery or mains into 14 RADIOGRAPHY the adjusting screw d, thence through the platinum contacts B, the primarywinding PP, thence back to the negative pole Tg. The circuit being com-pleted, the core T becomes magnetised, the iron hamme
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