. The principles and practice of roentgenological technique . erable 23 24 INDUCTION COIL to a bar of soft iron, because it is less easilyheated. But a core of varnished soft iron plates,having a high resistive index, is the most effi-cient of all. The core is enclosed within ahollow cylinder of some insulating materialof rubber or fiber. Primary Winding: Upon this insulatingtube there is wound the primary winding con-sisting of one or several layers of insulatedcopper wire (gh) of sufficient coarseness to beable to carry heavy currents without ends of this wire terminate in contac
. The principles and practice of roentgenological technique . erable 23 24 INDUCTION COIL to a bar of soft iron, because it is less easilyheated. But a core of varnished soft iron plates,having a high resistive index, is the most effi-cient of all. The core is enclosed within ahollow cylinder of some insulating materialof rubber or fiber. Primary Winding: Upon this insulatingtube there is wound the primary winding con-sisting of one or several layers of insulatedcopper wire (gh) of sufficient coarseness to beable to carry heavy currents without ends of this wire terminate in contacts atthe side, for connection with the primary orinducing current. ( Fig. 23.) This primary winding may consist of asingle strand of coarse wire wound from oneend of the core to the other and then back,the two layers being separated by some insu-lating material. There may also be severalseparate strands of wire wound in this man-ner, one over the other, each layer being insu-lated from the other and each strand term-inating in a separate terminal. A primary. Fig. 23.—Plan of construction of a coil. Ab—pri-mary (open core), gh—primary winding, cd—insulating material, ef—secondary terminals.(Gocht) of the latter construction is called a variableinduction primary. It is possible with sucha primary to vary the induction for tubes ofdifferent vacua, by using either a single wind-ing or connecting the various windings seriallyor in parallel. By using the windings seriallythe self-induction is greatly increased and thetrue induction thereby inhibited, thus makingit applicable for the energizing of a tube oflow vacuum. The self induction is minimizedwhen the windings are connected in parallelbut the maximum inductive eftects are ob- tained, for the production of rays in a tube ofhigh vacuum.* The primary windings are thorougljly andentirely covered by an insulating sheath (c)usually made of mica (which gives best ser-vice), rubber or gutta percha or primary may
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
