. Radiography, X-ray therapeutics and radium therapy . are connected up to terminals at one end of thecoil and vary the quantity of current in the primary. They may be wiredup to a switch-table and controlled from there, so that the operator mayselect the winding most suitable for the work required. This arrangement, combined with a triple Wehnelt electrolytic in-terrupter, enables us to have a wide range of action to select from. The essential parts of an induction coil are : (a) A primary coil consisting of a number of thin sheets of metal or wireof a special magnetic iron round which a numb
. Radiography, X-ray therapeutics and radium therapy . are connected up to terminals at one end of thecoil and vary the quantity of current in the primary. They may be wiredup to a switch-table and controlled from there, so that the operator mayselect the winding most suitable for the work required. This arrangement, combined with a triple Wehnelt electrolytic in-terrupter, enables us to have a wide range of action to select from. The essential parts of an induction coil are : (a) A primary coil consisting of a number of thin sheets of metal or wireof a special magnetic iron round which a number of turns of thick copperwire are wound. This is placed in an ebonite tube to insulate it from thesecondary coil. The thin sheets should also be insulated from each other. (b) The secondary coil consists of many thousand turns of thin copper THE INDUCTION COIL 13 wire wound in a number of thin vertical sections. A diagrammatic repre-sentation will best show the connections of the primary, secondary, con-denser, and interrupter of an induction Fig. 8.—Induction coil. (Newton 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
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