. Dental and oral radiography : a text book for students and practitioners of dentistry . S) should be wid-ened to about four inches, and the desired work-ing current again passed through the tube for aninstant. If the tube lights up with a clear sharpactive hemisphere deep apple green in color witha lack of greenish light back of the target, youthen know it is ready for work. If an x-ray machine is not equipped with athird terminal, the same results in regulating the DENTAL AND ORAL RADIOGRAPHY TECHNIC 115 tube may be effected by using the regulating ad-juster (Fig. 51), the end of which can
. Dental and oral radiography : a text book for students and practitioners of dentistry . S) should be wid-ened to about four inches, and the desired work-ing current again passed through the tube for aninstant. If the tube lights up with a clear sharpactive hemisphere deep apple green in color witha lack of greenish light back of the target, youthen know it is ready for work. If an x-ray machine is not equipped with athird terminal, the same results in regulating the DENTAL AND ORAL RADIOGRAPHY TECHNIC 115 tube may be effected by using the regulating ad-juster (Fig. 51), the end of which can be placedat the desired distances from negative wire nearits point of attachment to the tube. The tubemay also be lowered by attaching the negativewire directly to the regulating chamber and pass-ing a small amount of current through the cir-cuit. These manipulations should be carried out A— -Assistant AnodeC—CathodeD—RcKuIatint?ChamberT—Regulating Ad- G— Hemisphete H—Connection WireI-Assistant Anode CapK—Anode ( ap I Cathode Cap M—Cathode StreamN—Focal Point. Fig. 51. iviih the greatest caution, for a tube is an ex-tremely delicate and sensitive piece of apparatusand will not stand abuse. A careless operator can quite easily reduce thevacuum to such a degree that the tube is a tube has a purple appearance when thecurrent is passed through it. If such a tube hasnot been too greatly abused, it will often regainits vacuum if given a rest. If this does not bringthe vacuum up, it can often be brought back in 1K*> DENTAL AND ORAL RADIOGRAPH^ the following way: The spiral spring (Fig. 51)connecting the anode and assistant anode, shouldbe removed and the positive wire from the ma-chine attached to the assistant anode (7). Thenegative wire is attached as usual (at L) and alight current is run through the tube for a min-ute or two at a time. If this is done once or twicea day for several days, the vacuum will usuallycome up. Any increase in vacu
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectradiographydental
