. American X-ray journal . inal A-W-L-tube whichMr. (Jelling has made in its presentform for over two years. The target isa hollow tube of seamless platinumdrawn by Baker & Co. For moderategenerators it is sufficient to cool the tai- get with the copper vanes shown in For more powerful ones a rotary aircompressor is furnished. For the mostpowerful apparatus it is necessary to coolthe target by discharging a stream ofwater against the back of it, the wasteescaping through the outer tube to anyconvenient receptacle. Trowbridge,Tesla, Edison and Williams cooled thedischarge tube soon after
. American X-ray journal . inal A-W-L-tube whichMr. (Jelling has made in its presentform for over two years. The target isa hollow tube of seamless platinumdrawn by Baker & Co. For moderategenerators it is sufficient to cool the tai- get with the copper vanes shown in For more powerful ones a rotary aircompressor is furnished. For the mostpowerful apparatus it is necessary to coolthe target by discharging a stream ofwater against the back of it, the wasteescaping through the outer tube to anyconvenient receptacle. Trowbridge,Tesla, Edison and Williams cooled thedischarge tube soon after Roentgen dis-covered that some of Lenards rayswould penetrate the human body, butthis was the first tube in which a hollowtarget was cooled to prevent it frommelting, and though it has been copiedby Europeans, the copies are less effi-cient and inferior in design. Vacuum Regulators : These are placedin various positions to suit customers. Inthe figure of the A-W-L-tube the regu-lator is made to support the stem of the. N FIG. -A-W-L FEEDER. cathode. This is its most symmetricalposition and the one recommended bythe designer of the tube, but it exposesit to some risk of injury. It may beplaced on the side of the tube instead ofthe usual water vapor potash regulator. It consists of a short piece of platinumtubing, one end being sealed into theglass. The other is closed by a piece ofpalladium w ire drilled out, leaving oneend solid, the other being soldered intothe platinum tube. When the vacuumis too high this tube is placed in thefeeder shown in Fig. 3, which is filledw ith water. The wires p and n are con-nected with the street current throughtwo sixteen-candle power lamps, or, iftins is not available, with a series of drycells in a convenient and portable the palladium is made negative, THE AM ERIC AX X-RAY JOURNAL 691 the hydrogen goes into the tube and low-ers the vacuum. The method of support-ing- the terminals in these tubes deservesmention. After showing tha
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