. The principles and practice of roentgenological technique . method as a tube whichis energized by a closed-core energizing current is controlled by regu-lating the primary amperage by the inter-rupter and rheostat. If a single point is used,this is plunged into the acid until the requiredgap is obtained With a multiple point inter-rupter, each point is set to take a certain equalamount of current andthen all the points areconnected in multiple distribution and the re-sulting current is controlled by the rheostat.\\ith a gas tube the vaciuuu is reduced untilthe sparking across
. The principles and practice of roentgenological technique . method as a tube whichis energized by a closed-core energizing current is controlled by regu-lating the primary amperage by the inter-rupter and rheostat. If a single point is used,this is plunged into the acid until the requiredgap is obtained With a multiple point inter-rupter, each point is set to take a certain equalamount of current andthen all the points areconnected in multiple distribution and the re-sulting current is controlled by the rheostat.\\ith a gas tube the vaciuuu is reduced untilthe sparking across the gap desired ceases. If only 5 to 7 milliamperes be used, a setdistance between regulator and cathode ter-minal will automatically regulate the tube totwice the distance in inches spark back-upacross the terminals. CHAPTER III INDUCTION APPARATUS—CLOSED CORE—INTERRUPTERLESS The ideal and most efficient apparatus, wherealternating current is available, by which toobtain a high tension alternating current is aclosed core transformer. The core consists. Fig. 33.—Closed magnetic circuit transformer. of laminated iron or prepared silicon steel incircular or rectangular form,—a closed ring orti parallelogram. The primary winding isplaced on one arm or side and the secondarywinding is placed on the opposite. But theymay both be placed on the same arm, over oradjoining each other. Practically all the magnetic lines of force are thus utilized. Thereis a minimal amount of magnetic leakage orstray magnetism which is not enclosed by thesecondary but for practical purposes it may beneglected and assumed that the induced e. m. turn of wire in the secondary is the sameas in the primary. Since the secondary and primary coils areboth wound on the same core, it follows thatthe actual voltage induced will be directlyproportional to the number of turns of wirein both coils. The ratio of primary to second-ary voltage will thus depend upon the ratio ofprimary to secondary windings.
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