. American X-ray journal . eSpOl on which they focus a powerfulshaft of x-rays. As this spot isquite small, skiagraphs, or radiograph;mad- with this or similar tubes arc al-ways well defined, and may now be madeespecially with tin- help of intensifyingscreens in a much shorter time thanwould have been considered possible at an earlier period of the photography ofthe invisible. Fig. 3 represents Thomp-sons double focus tube, having two ca-thode electrodes, the rays from whichare projected simultaneously against theY-shaped anode placed between them.( Not showm.) Leonards double focus tube iscon
. American X-ray journal . eSpOl on which they focus a powerfulshaft of x-rays. As this spot isquite small, skiagraphs, or radiograph;mad- with this or similar tubes arc al-ways well defined, and may now be madeespecially with tin- help of intensifyingscreens in a much shorter time thanwould have been considered possible at an earlier period of the photography ofthe invisible. Fig. 3 represents Thomp-sons double focus tube, having two ca-thode electrodes, the rays from whichare projected simultaneously against theY-shaped anode placed between them.( Not showm.) Leonards double focus tube isconstructed in such a way that a properlocalization without any other device isnot only possible, but sure and simple.(See : Amer. X-Ray Journal, Nov. 1899.)There are tubes in the market suppliedwith additional chamber containing vol-atile salts or wires, the heating of whichreduces the vacuum of the tube, andthus a more uniform vacuum can be ob-tained or the vacuum itself may be regu-lated . Mullers Universal Roentgen Tube G. K etc.) Mullers Universal Roentgen Tubewith auxiliary tube for regulating thevacuum to either a high or low degreeis the latest. The advantages of thisregulating modus operandi comprise thefollowing: 1. That the use of a flame is entirelyabrogated and, 2. That the regulating device can beUsed in the simplest and most effective THE AMERICAN X-RAY JOURNAL. 1055 manner as an automatic regulator whilethe application is proceeding, and 3. That by reason of the addition ofthe auxiliary tube it recommends itselfspecially for long exposures as well asfor exact impressions. 4. Most important of all advantages isthe fact that the regulating elementscontained in the auxiliary tube are soplentifully present that the longevity ofthe tube is thereby secured and withcareful use should last for a long time. Fig. 5 represents the tube, which wasdevised by Edison. Two slanting disksmutually converge the cathodic streamto the area of the glass bulb, at certainangle. With such
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