. American X-ray journal . today. Thesechanges are taking place with extremeslowness, and it is even possible that theradioactive materials themselves are in-termediate stages in the disintegration ofa primal element. On the other hand, itmay be that all matter is passing throughthis process of disintegration, is livingits life, though the change, as comparedwith that of the radioactive materials, isso slow as not to be detectable. As shownabove, an atom might lose particles with-out the change in atomic weight beingdectectablo. The change may be so slowthat the electrical effects are not meas
. American X-ray journal . today. Thesechanges are taking place with extremeslowness, and it is even possible that theradioactive materials themselves are in-termediate stages in the disintegration ofa primal element. On the other hand, itmay be that all matter is passing throughthis process of disintegration, is livingits life, though the change, as comparedwith that of the radioactive materials, isso slow as not to be detectable. As shownabove, an atom might lose particles with-out the change in atomic weight beingdectectablo. The change may be so slowthat the electrical effects are not measure-able, and the products can not accumulatein sufficient quantities to be detected bychemical means.—Electrical Review. Adjustable Anode for X=Ray Tubes. BY R. V. WAGNBBj M. D., CHICAGO, TLL. The shadow of an object in sunlight same differences appear in x-ray pictureshas its edges blurred, on account of the a:i<l in shadows upon the coming from a large number of When the kathode stream comes to a. points. The si adow of an object under sharp focus upon the anti-kathode the the light of an arc lamp, on the other x-rays diverge from that as a common hand, is sharply defined because the light center and a sharply defined shadow or comes from a very small area. These picture is obtained. The focal distance 88 THE AMERICAN X-RAY JOURNAL. [March, Kjof varies with the vacuum of the tube, con-sequently it is not possible to insure sharpdefinition under all conditions with eventhe best tubes, and in constructing atube the maker is obliged to guess at thebest distance to make between the kathodeand the anti-kathode. There is noway oftesting the accuracy of his guess until thetube is exhausted and properly excited. In my new tube the anti-kathode ismounted on a threaded stem which can bemagnetically operated thru the glass, soas to move it up or down or circumfer- of the anode. It will stand an unlim-ited degree of heat and unlimited usage,even with the sharpest
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