The London, Edinburgh and Dublin philosophical magazine and journal of science . kess tube, if this surface be sufficientlv thin. 12th Experiment. —In a bulb similar to that of fig. 1 thetwo photographic cylinders were composed, each of them, ofthree small cylinders placed in a line and respectively coveredwith black paper, with a sheet of aluminium and one of pla-tinum, all of the thickness of j§-q- of a millimetre. In the small cylinder covered with aluminium an impressionwas obtained weaker than the one noted in the small cylindercovered with paper ; and on the small cylinder covered withpl
The London, Edinburgh and Dublin philosophical magazine and journal of science . kess tube, if this surface be sufficientlv thin. 12th Experiment. —In a bulb similar to that of fig. 1 thetwo photographic cylinders were composed, each of them, ofthree small cylinders placed in a line and respectively coveredwith black paper, with a sheet of aluminium and one of pla-tinum, all of the thickness of j§-q- of a millimetre. In the small cylinder covered with aluminium an impressionwas obtained weaker than the one noted in the small cylindercovered with paper ; and on the small cylinder covered withplatinum, a still weaker one than on the one covered withaluminium, both in front and at the back of the reflector. 13th Experiment.—Three small cylinders prepared respec-tively in the same manner as in the 12th experiment were placedat the same moment on the direct line followed by the cathodicrays in an ordinary Crookess tube. The same results were obtained as in the preceding experi-ment with the same relations between the respective photo-graphic impressions. -p. , „. lUh Experiment.—For this experiment a bulb was con-structed slightly differing from the preceding ones. Thisalso was spherical, and the two electrodes entered it throughthe two horizontal tubes A and B (fig. 2), and the reflector the Cathodic Rays and those of Rontgen. 171 penetrated in it likewise through the vertical tube C. Buton the part of the bulb facing the said reflector was soldereda large tube M closed by a bimetallic disk, composed,namely, half of an aluminium sheet of the thickness of halfa millimetre, and the other half also of a sheet of aluminiumof the thickness of one millimetre. On the diameter alongwhich the two sheets fitted together a thick sheet of zinc wassoldered perpendicularly to the plane of the disk. In front of both the two sheets that formed the disk a smallphotographic cylinder was placed, on the extremities of whichtwo figures were respectively fixed ; one made with the th
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
