. Radiography and radio-therapeutics . A and B are positives from negatives obtained of an aluminium laddertaken with the same tube and the same number of milhampere-seconds. A was taken with a spark coil wnth 6 milhamperes and 12 seconds =72 milhampere-seconds. B was taken with an alternating transformer 6 milhamperes and 12seconds. The result in A is much better than in B. 240000-200000 -i: 160000- 120 toooo 4OOO0 16 4 i /<(§.. Fk;. 24.—Diagram of the discliarge Iloiii u siiai 1Loil. k;. I:>.—Diagram of the discharge from an alter-nating cinrent transformer. (Schall.) it is also stated
. Radiography and radio-therapeutics . A and B are positives from negatives obtained of an aluminium laddertaken with the same tube and the same number of milhampere-seconds. A was taken with a spark coil wnth 6 milhamperes and 12 seconds =72 milhampere-seconds. B was taken with an alternating transformer 6 milhamperes and 12seconds. The result in A is much better than in B. 240000-200000 -i: 160000- 120 toooo 4OOO0 16 4 i /<(§.. Fk;. 24.—Diagram of the discliarge Iloiii u siiai 1Loil. k;. I:>.—Diagram of the discharge from an alter-nating cinrent transformer. (Schall.) it is also stated that in order to get an equally good picture with analternating transformer it was necessary to give an exposure of a httle over300 millianij)ere-seconds, that is, more than 3 times the exposure givenin the experiment A, or 300 to 72 milhampere-seconds. The plate facing this page shows the results of experiments carriedout with a view to corroborating the above. They were conducted underthe same conditions as nearly as possible. The same measuruig mstrumentswere used, and also the same tube. The transformer was a Victor machine,the coil a IG-inch one.
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