. Elementary and dental radiography / by Howard Riley Raper . Fig. 15. Interrupterless coil. The electrolytic interrupter consists of a glass jar containing a solu-tion of sulphuric acid in water, the electrolyte, in which is immersed aplatinum point electrode, A (Fig. 20), and a lead electrode, B. Theplatinum is covered with a porcelain sheath, C, except for its point, whichprojects into the electrolyte. Little or much of the point may be exposedin the acid by the regulating arm, D. We have two wires now leading from the mains to our apparatus. X-RAY MACHINES 19 Of these one is the positive w
. Elementary and dental radiography / by Howard Riley Raper . Fig. 15. Interrupterless coil. The electrolytic interrupter consists of a glass jar containing a solu-tion of sulphuric acid in water, the electrolyte, in which is immersed aplatinum point electrode, A (Fig. 20), and a lead electrode, B. Theplatinum is covered with a porcelain sheath, C, except for its point, whichprojects into the electrolyte. Little or much of the point may be exposedin the acid by the regulating arm, D. We have two wires now leading from the mains to our apparatus. X-RAY MACHINES 19 Of these one is the positive wire which brings the electric current, andthe other is the negative or return wire. The positive wire must be at-tached to the binding post of the platinum electrode, marked -f-. ( Fig. 10. Induction coil for use with storage cells. 20.) But how can we tell which is the positive wire? Cut some of theinsulation off the ends of the wires, immerse them in a glass of water,and bubbles will be given off from the negative wire. When makingthis test, care should be taken not to touch one wire to the other, somaking a short circuit. The term (short circuit) almost explains desired circuit in this instance is from the positive wire, through thewater, which is highly resistive to the flow of electricity, into the negativewire and back to the mains. Suppose that the wires come in contact 20 ELEMENTARY RADIOGRAPHY (that portion of the wires from which the insulation has been removed),the current no longer passes through the water, but takes the shorterpath of less resistance, passing directly from positive to negative the amperage formerly used and choked back by the resistive waterflows through the wires, heating them rapidly. + - FusesSwitch Sliding Ro
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