. The principles and practice of roentgenological technique . ■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. Fig. 34.—Diagram of construction of a closed coretransformer. The primary and secondary arewound on the same arm. ab—iron core, gh—primary winding, cd—insulating material, ef—secondary terminals. a high tension direct pulsating current, bothinduct
. The principles and practice of roentgenological technique . ■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. Fig. 34.—Diagram of construction of a closed coretransformer. The primary and secondary arewound on the same arm. ab—iron core, gh—primary winding, cd—insulating material, ef—secondary terminals. a high tension direct pulsating current, bothinductive phases of the alternating current be-ing utilized. The efficiency of such a transformer is farhigher than that of a coil. The term effi-ciency denotes the value of the ratio of out-put to the input. The difference is the powerlost. These losses are due to the internalresistance of the copper wire and to the loss of power from hysteresis and eddy efficiency of the transformation in a coilis only about fifty to seventy-five per cent,because of magnetic leakage. The efficiencyof the alternating current transformer isabout 95%, but its actual value will dependto a certain extent upon the design, amountand quality of the materials used. Thereshould be sufficient cross section of laminatediron of proper quality and these
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
