. Elementary and dental radiography . graphs can be made instantaneously. A tube will not standsuch a current without injury for longer than about fifteen seconds atmost. Some induction coils, nol yet on the market, but under construction, *There are some special steps in technic when using a high-frequency coild of an induction coil r transformer. These stcp^ arc not mentioned here,hut will be found immediatelj following tin- summary of the conditions under whichthe negative for Fig, L15 was made. MAKING DENTAL RADIOGRAPHS 89 will be, if we are to believe the men who are making them, able to
. Elementary and dental radiography . graphs can be made instantaneously. A tube will not standsuch a current without injury for longer than about fifteen seconds atmost. Some induction coils, nol yet on the market, but under construction, *There are some special steps in technic when using a high-frequency coild of an induction coil r transformer. These stcp^ arc not mentioned here,hut will be found immediatelj following tin- summary of the conditions under whichthe negative for Fig, L15 was made. MAKING DENTAL RADIOGRAPHS 89 will be, if we are to believe the men who are making them, able to forcefrom 80 to 200 milliamperes through a hard tube. A tube could notstand such a current longer than a second or so, if so long. After testing the coil, throw off the switch and hitch up the the terminal tapes tight, so they will not come unhooked fromthe tube while it is in operation. When a terminal becomes disconnectedfrom the tube while the current is passing through it a puncture of thetube sometimes Fig. 80. Position of the film in the mouth for making radiographs of the upper bicuspid and first molar region. Set the tube-regulating arm to give a tube-regulating spark gap of 4inches. This is not an invariable rule. Perhaps the gap should be 5inches when a tube is new and reduced to 3 or 2 inches when the tubeis old. And so with many statements following—they are subject tovariation; they are calculated only to give a beginner something tangibleto start with. When the tube is hitched to the coil, separate the sliding rods theentire distance of the maximum spark gap. See to it that the terminaltapes or the tube are not near any conductor, or the current may jumpto it—the conductor. If this occurred from the tube it might bepunctured. Turn on the switch just for a moment, then off, then on, thenoff, and so on, slightly lengthening the time the current is left on untilit is observed to pass through the tube without a spark at the tube-regu- DENTAL RA
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