. The principles and practice of roentgenological technique . tt-age will also be 220, therefore the amperageof the secondary discharge would be 1/10 ofan ampere or 100 milliamperes. The primary is usually wound in severallayers or sections. These are arranged to givedifferent voltages and when the full line volt-age is used without rheostat control, the sec-ondary output-is fairly constant, for the par-ticular winding used with the same resistancein the secondary circuit. Because of the oscillation of the currentfrom zero to maximum the alternating currentis analogous in action on the transfo
. The principles and practice of roentgenological technique . tt-age will also be 220, therefore the amperageof the secondary discharge would be 1/10 ofan ampere or 100 milliamperes. The primary is usually wound in severallayers or sections. These are arranged to givedifferent voltages and when the full line volt-age is used without rheostat control, the sec-ondary output-is fairly constant, for the par-ticular winding used with the same resistancein the secondary circuit. Because of the oscillation of the currentfrom zero to maximum the alternating currentis analogous in action on the transformerto the action of the direct current and inter-rupter in the induction coil. The current,however, reverses its direction not with themake and break, but the change in directionof the primary flow. CLOSED CORE TRANSFORMER 35 The high potential current in the secondaryis alternating, differing from that produced byan induction coil in being more nearly equal inboth phases. For utilization in an x-ray tubeit must of course be made unidirectional. This Core-. ■Jccori(/ary ) 4 q/npef£3 ^S 7e//r73 Fig. 33a.—Illustrating the principles of transformeraction. is done by a rectifying switch or rotary polechanger. This changes the direction of theinverse wave, so that the high tension alter-nating current is practically transformed into e f S i - d c
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
