. Science-gossip. ered outthrough the glass as Rontgen rays. In a later formot tube there is an aluminium anode in addition tothe anti-cathode, but it is the latter that receives thebombardment of the cathode rays. When used, thisform of tube has. the anode and anti-cathode con-nected together outside, so that both are in com-munication with the positive terminal. When w:orking with these forms of X-Ray tubes,two difficulties present themselves. Firstly : underdifferent conditions of working and different sparklengths, the one tube with its one degree of exhaus-tion and one value of resistance
. Science-gossip. ered outthrough the glass as Rontgen rays. In a later formot tube there is an aluminium anode in addition tothe anti-cathode, but it is the latter that receives thebombardment of the cathode rays. When used, thisform of tube has. the anode and anti-cathode con-nected together outside, so that both are in com-munication with the positive terminal. When w:orking with these forms of X-Ray tubes,two difficulties present themselves. Firstly : underdifferent conditions of working and different sparklengths, the one tube with its one degree of exhaus-tion and one value of resistance cannot be : upon continued working, it is found thatthe exhaustion, and therefore the penetrating value,of the tube increases, so that finally, in spite otrepeated heatings by a Bunsen flame or other source,to increase the pressure inside, the resistance of thetube becomes so high that the electrical dischargewill not take place under the same conditions forwhich the tube was originally
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
