Anthony's photographic bulletin for .. . between screen and discharge tube. This resultis obtained from three very consistent sets of observations at distances of 100 and200 millimeters. Hence, air absorbs the X rays much less than the cathode result is in complete agreement with the previously described result, that thefluorescence of the screen can be still observed at 2 meters from the vacuum general, other bodies behave like air; they are more transparent for the X raysthan for the cathode rays. (11) A further distinction, and a noteworthy one, results from the action of
Anthony's photographic bulletin for .. . between screen and discharge tube. This resultis obtained from three very consistent sets of observations at distances of 100 and200 millimeters. Hence, air absorbs the X rays much less than the cathode result is in complete agreement with the previously described result, that thefluorescence of the screen can be still observed at 2 meters from the vacuum general, other bodies behave like air; they are more transparent for the X raysthan for the cathode rays. (11) A further distinction, and a noteworthy one, results from the action of amagnet. I have not succeeded in observing any deviation of the X rays even in verystrong magnetic fields. The deviation of cathode rays by the magnet is one of their peculiar character-istics; it has been observed by Hertz and Lenard, that several kinds of cathode raysexist which differ by their power of exciting phosphorescence, their susceptibility ofabsorption, and their deviation by the magnet, but a notable deviation has been ob-. 7^ served in all cases which have yet been investigated, and I think that such deviationaffords a characteristic not to be set aside lightly. (12) As the result of many researches, it appears that the place^of most brilliantphosphorescence of the walls of the discharge tube is the chief seat whence the Xrays originate and spread in all directions ; that is, the X rays proceed from the frontwhere the cathode rays strike the glass. If one deviates the cathode rays within thetube by means of a magnet, it is seen that the X rays proceed from a new point, i. e.,again from the end of the cathode rays. Also for this reason the X rays, which are not deflected by a magnet, cannot beregarded as cathode rays which have passed through the glass, for that passage can-not, according to Lenard, be the cause of the different deflection of the rays. HenceI conclude that the X rays are not identical with the cathode rays, but are producedfrom the cathode rays at
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectphotogr, bookyear1870
