EXPEKMENTS WITH IONIZED AIR. 



n 



at h (not shown) leading to the phosphorus tniiu as above, the influx canal of V 

 was moditied by the addition of a lateral tube, h, with tlie wide stop-cock at c, and 

 a small one at d communicating with the outside air. The bucket was replaced by 

 an enormous Mariotte flask, M, of copper, having tlie tube if, within and an outlet 

 at q, joined by half-inch i-ubl)er hose to c. The pulley at^ is in action as Ijefore. 

 When the apparatus is in operation, the water pressure on Fis equivalent to the 

 difference of level between d and /. Hence the head is constant, e and d being 

 closed during influx. The gauge U, measures variations of this [)ressure. At the 

 end of the experiment, c and d are opened and M lowered, insuring rapid flow 

 when the stopper or valve at v is removed. 



Fig. I. — Gasometer Train and Color Tube. Scale j'j. 

 Multiple. Scale \. 



Fig. 2.— Influx Pipe with Ionizers in 



In figure 2, three phosphorus tubes are used at once for purposes to be 



explained below. 



3. Results.— In making the observations, it was customary to observe the 

 thermometer T, for the temperature 6, and the steam gauge for the pressure, p, at 

 the Jet The volume V, of air flowing per minute out of the gasoraetei', was next 

 taken when the given color stated was clearly seen throughout the dust discharge 

 into C. All these results are given in the following table 1, where the volume 



