. Journal of radiology . higher ab-sorptions the log. formulaabove referred to must beused.) If a solution of copper sulphatebe held in front of an incandescentlamp it is well known that onlythe green and the blue in the spec-trum of the incandescent lamp aretransmitted, the yellow and redare absorbed. If, however, wehold in front of the incandescentlamp a solution of potassiumbichloride the exact opposite istrue, i. e., the blue and the greenare absorbed, but the yellow andred are transmitted, and so far aswe have been able to discover,there is no known relation be-tween the absorption of pot
. Journal of radiology . higher ab-sorptions the log. formulaabove referred to must beused.) If a solution of copper sulphatebe held in front of an incandescentlamp it is well known that onlythe green and the blue in the spec-trum of the incandescent lamp aretransmitted, the yellow and redare absorbed. If, however, wehold in front of the incandescentlamp a solution of potassiumbichloride the exact opposite istrue, i. e., the blue and the greenare absorbed, but the yellow andred are transmitted, and so far aswe have been able to discover,there is no known relation be-tween the absorption of potassiumbichloride and of copper doubtless exist, but theircomplexity so far has defied dis-covery. It is well known that carbon isa particularly opaque , likewise, is opaque, butif these two substances are com-bined in the atomic proportionsof carbon disulphide a nearlycolorless liquid results, transpar-ent so far as visual observationsgo, to all wave lengths. Watch The Journal—// Leads! A. Fig. 2 will illustrate the com-plexity of the absorption laws inthe visible region of the spectrumfor the three elements, silver, goldand platinum. Although for or-dinary purposes metals are con-sidered opaque to ordinary light,yet by special means they can beprepared in films thin enough forabsorption studies. The irregu-larity of the absorption of silverwill be noted. It appears to behighly absorbent in the infra redregion of the spectrum, its ab-sorption decreases as one goesthrough the visible region fromred to violet, which means thatthin films of silver would be ABSORPTION OF X bhush, and in the ultra violet thereis a very narrow region of hightransparency. It would be ex-tremely difficult, if not impossible,to attempt to express the absorp-tion constant of silver as a func-tion of wave length. The samething is true of gold and of plati-num. And a glance at the curveswill show that there is no appar-ent relationship between the ab-sorption of these three
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