. Dental radiology . s of mercury, while a medium vacuum would have onehundred thousandth part of the original air, and a low vacuumwould be where one thousandth part remains, or an equivalentpressure of about .005 millimeters of mercury. In this sphere of glass (A) or X Ray tube, as we willcall it, we have the condition of medium vacuum, i. ahundred thousandth per cent, vacuum, which is about thedegree of exhaustion necessary for satisfactory dental this tube we have two metal electrodes represented in thediagram by the lines DWE and FXG. They are disks of metalplaced at opposite
. Dental radiology . s of mercury, while a medium vacuum would have onehundred thousandth part of the original air, and a low vacuumwould be where one thousandth part remains, or an equivalentpressure of about .005 millimeters of mercury. In this sphere of glass (A) or X Ray tube, as we willcall it, we have the condition of medium vacuum, i. ahundred thousandth per cent, vacuum, which is about thedegree of exhaustion necessary for satisfactory dental this tube we have two metal electrodes represented in thediagram by the lines DWE and FXG. They are disks of metalplaced at opposite sides of this tube and parallel with eachother. They are connected by wires passing through the glasswall, to terminals on the outside, C and B. which can in turnbe connected with the source of electricity. We will now passa high potential current of electricity through this tube, i. e., acurrent of from 60,000 to 180,000 volts. This high potentialcurrent, the nature of which we will take up a little later, enters 34. Figure 2—(see page 34)dentalradiolog00satt
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