1897.] Newly Prepared Gases. 347 



that either of them could be readily connected to the insulated 

 quadrants of the eloctrometer. 



The experiments were conducted in the following manner. 

 The sulphuric acid bulbs were carefully weighed and then con- 

 nected by indiarubber tubing to the glass tubes which were 

 imbedded in the paraffin blocks as shown in the figure. The 

 current through the cell was switched on for a few minutes before 

 joining the bulbs into the series, so as to drive the air out of A 

 and B. As soon as the gas began to bubble through the acid in 

 F a stop watch was started. By connecting the conductors F and 

 G alternately to the quadrants of the electrometer the rate at 

 which each was acquiring a charge was found. The sum of the 

 charges acquired by F and G denotes the total charge passing out 

 of B and that acquired by F divided by the total is the dis- 

 charging power of the bulbs. After the stream of gas from the 

 cell had been running through the apparatus for a sufficient time 

 the bulbs were removed, and dry air was drawn through them 

 before weighing them a second time. In each experiment a 

 current of 14 amperes was used which was kept constant by 

 having an ammeter and an adjustable resistance in the circuit. 



In order to reduce the readings on the electrometer scale to 

 absolute units it was found that when F was connected to the 

 quadrants and the other conductors to earth, each scale division 

 represented "0040 electrostatic units of quantity, and when G was 

 connected to the quadrants the scale divisions each represented 

 "0036 electrostatic units. The inductor / which was used with 

 hydrogen had a larger capacity than either of the other two con- 

 ductors, and when it was connected to the quadrants it required 

 "0042 electrostatic units to make the spot of light on the electro- 

 meter scale move through a division. 



The following tables give the results of the experiments which 



were made with the different gases, 9 is the temperature in 



degrees centigrade of the water in B, W the increase in the weight 



of the sulphuric acid bulbs, and n^ and n 2 the numbers of divisions 



that the spot of light on the electrometer scale moves per minute 



when F and G [or /] are connected to the insulated quadrants ; w 



is the calculated weight of the moisture necessary to saturate the 



volume of gas v at temperature 6 which passes through F in the 



W-w 

 course of the experiment, the weight of the cloud per c.c, 



and p the charge per c.c. on the gas. The volume v is easily cal- 

 culated as the gas is evolved by a known current. 



Table I. gives the results obtained with positive oxygen. In 

 each experiment a current of 14 amperes was used, and the stream 

 of the evolved gas passed through F for 20 minutes. 



