. American X-ray journal . been soconnected that the negative—or cathodecurrent passes through the. aluminumplate, which is in the tube, disk or anyother device, the light which appearswill be of a pale green color, and al-most completely fill the space betweenthe electrodes, while the x-ray may beinstantly seen with the rluoroscope. If,however, the anode positive currentpasses into the tube through the alum-inum electrode, the green light will bediffused part behind the platinum elec-trode and part of the lower edge of thebulge, while no light can be made out onthe screen of the rluoroscope.
. American X-ray journal . been soconnected that the negative—or cathodecurrent passes through the. aluminumplate, which is in the tube, disk or anyother device, the light which appearswill be of a pale green color, and al-most completely fill the space betweenthe electrodes, while the x-ray may beinstantly seen with the rluoroscope. If,however, the anode positive currentpasses into the tube through the alum-inum electrode, the green light will bediffused part behind the platinum elec-trode and part of the lower edge of thebulge, while no light can be made out onthe screen of the rluoroscope. In sucha case, the wires which are connectedto the- tube should be reversed. The Kinraide Induction coil was al-ready mentioned; it consists of two sep-arate secondaries with their primariesconnected in scries Fig. i). The weak-feature of the common Ruhmkorff coil is the heat developed in primary, but inthis coil insulation can not be meltedand no delicate part of the apparatus willsuffer by the heat generated. The Kin-. Fig. 9. raide coil is portable, safe in operation,simple in construction, durable and maybe operated with comparatively smallamount of the current, giving strong x-ray light and great volume. The dif-ficulty attending prolonged exposuredoes not exist, the skiagraphs will bevery tine and finished negatives give fulldetail, and are as usually better than thepositives. There is another good coil to be men-tioned and designated by Rollins. Thevacuum in the tube with this apparatusmay be regulated by moving rubberhandles in front of the coil in and contrast of light with tubes of dif-ferent resistance may be observed veryeasily and with a Electrolytic-Interrup-ter the apparatus may be run for manyhours daily. The coil may be operatedfrom the direct or alternating currentof 110 volts. In case of any strikingly new develop-ment, the apparatus as first used is al-ways a modified form of that alreadyexisting, but this gradually is abandonedand new types arise,
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