. American quarterly of roentgenology . lysimilar conditions without a secondary being associatedwith the primary. The new wiggles in the curve may beexplained in brief as being due to brush discharges fromthe terminals of the secondary and the oscillation of thesecondary as an open circuited resonator, mainly the latter. (S. No. 10) If we permit sparking at the secondaryterminals—the bright snappy kind of a spark—but main-tain all other conditions as in curve No. 9, we get thiscurve No. 10. Here we have the saw teeth due to theoscillations of the secondary, but the decrease of the self-induct
. American quarterly of roentgenology . lysimilar conditions without a secondary being associatedwith the primary. The new wiggles in the curve may beexplained in brief as being due to brush discharges fromthe terminals of the secondary and the oscillation of thesecondary as an open circuited resonator, mainly the latter. (S. No. 10) If we permit sparking at the secondaryterminals—the bright snappy kind of a spark—but main-tain all other conditions as in curve No. 9, we get thiscurve No. 10. Here we have the saw teeth due to theoscillations of the secondary, but the decrease of the self-induction of the primary caused by the sparking is verymarked. (S. No. 11) By operating the coil at its full outputand producing a fat, fuzzy spark between the terminals weobtain a current curve for the primary as No. 11. When a mercury jet or platinum break is used thecurrent curve in the primary is very complicated if spark-ing is permitted to take place at the terminals of the sec-ondary or if an X-ray tube is excited by the coil. The. Oscillographic Tracings to Illustrate Mr. Snooks Paper OF ROENTGENOLOGY. 39 discussion of a number of such curves which the speakerhas taken from different coils is beyond the scope of thispaper and are therefore omitted. (So. No. 12) Upon investigating the currents whichflow in the secondary coil at its middle, we discover thateven without sparking at the terminals, or the operation ofa tube, that current is flowing in the secondary at its middle-This is a necessary condition from the oscillations oc-curring in the winding of the secondary, which were notedbefore. This curve, No. 12, is of this oscillating currentwhen the electrolytic interrupter is used with a low valueof inductance in the primary. (S. No. 13) Curve No. 13 was taken under the sameconditions as No. 12, with the exception that a brightsnappy spark was occurring at the secondary effect of the sparking is seen in the extra tiny wigglesand the slight change in contour
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