. The Becquerel rays and the properties of radium . be at h, causing jihosphores-cence. They penetrate the glow of the main discharge, which curves away to the anode,c, in a lateral tube joined on to the main one. the name of the cathode rays. The cathode raysalways proceed at right angles to the cathode,whether that is the direction in which the anode liesor not. The spark or glow discharge which, at theselow pressures, is quite inconspicuous, of course pro-ceeds from anode to cathode, and will turn a cornerwithout difficulty. This the cathode rays will not path is essentially rectil
. The Becquerel rays and the properties of radium . be at h, causing jihosphores-cence. They penetrate the glow of the main discharge, which curves away to the anode,c, in a lateral tube joined on to the main one. the name of the cathode rays. The cathode raysalways proceed at right angles to the cathode,whether that is the direction in which the anode liesor not. The spark or glow discharge which, at theselow pressures, is quite inconspicuous, of course pro-ceeds from anode to cathode, and will turn a cornerwithout difficulty. This the cathode rays will not path is essentially rectilinear (fig. 3). A thick, solid obstacle placed in the path of thecathode rays casts a perfectly sharp and definiteshadow. The outline of the object is seen on the B 2 THE BECQUEREL RAYS wall of the vessel as a black shadow on the bright 1,reen fluorescent background (fig. 4). Glass is not theonly substancewhich becomesfluorescent underthe influence ofthe cathode other ma-terials will do thesame, and some ofthem give morebrilliant effects. thanThus, glass,for in- Fio. 4.—Arrangement for showing that the cathode raysare stopped by a solid obstacle, and cast a sharp pear-shaped vessel, a, is used, which is higlily ])lane or slightlv convex cathode, ), sends out the rays,wliich cause brilliant green fluorescent luminosity on thei>pi)Osite wall, r. The metal cross, rf, which serves as anode, stanCC CalCSParstands in the path of the rays, and casts a sharp black shadow ^ on the luminous background. OloWS with a beautiful orange-red colour. Rubies give a deep redcolour, far more effective than anything that theyshow in the ordinary way. No rule can be given asto whether a substance may be expected to can only be ascertained by trial. The most characteristic and interesting propertyof the cathode rays is that they are deflected by amagnet. The deflection is very conspicuous and easyto observe. It is only necessary to bring a commonho
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectradioac, bookyear1906
