EXPERrMENTS WITH IONIZED AIR. 



wlieii tlie cock is closed. Even when phospliorus is contained in the bottom of a 

 bottle, it is not liable to diffuse out of the mouth in sufficient quantity to color 



ng 



9,b 





Fig. 12. 



Fig. K 



Fi 



g. 15. \/ 



I ir,. qa, 9*.— pHosriioRus Ionizers. Scalk \. Kic. 10.— Sknsitive Points, etc., of the Influx Pipe. 

 l-n;. II.— Apparatus for Heatino the Emanation. Figs. 12, 13, 15.— Electrical (High Potential) 

 Ionizers. Kig. 14. — Spiral Brush. 



the Jet. To lie effective the dust must therefore be conveyed into the liil)e by 

 convection. 



The tube is to be from 6 to 12 inches long or longer, depending on the velocity 

 of tilt' current of air t«j be passed through it. If the current is too rapid, the 

 phosphorus is apparently chilled or oxydized too highly, so that the air which 



