388 



Mr. T. R. Merton on a Method of 



The tubes were cleaned by drawing through them con- 

 centrated sulphuric and chromic acids, followed by distilled 

 water, and were dried by heating to about 100° C. and drawing- 

 air through them. 



The results obtained for three tubes are given in the 

 following tables. 



Tube A at 18° C. Length of Capillary = 14*0889 cm. 





Comparison 

 Resistance. 



Resistance of 

 Capillary Thread. 



1st Filling 



18-509 ohms 



18609 



18709 



18-614 ohms 



18-613 



18-611 





2nd Filling 



18-709 

 18-609 

 18-509 



18-612 

 18-611 

 18-613 





3rd Filling 



18-509 

 18-609 



18-605 

 18-605 





Reset* 



18-609 

 18-709 

 18-509 



1S-604 

 18-602 

 18-604 



4th Filling 



18-609 

 18-709 



18-621 

 18-620 





Reset 



18-709 

 18-709 



18-616 

 18-616 



Reset 



5th Refilling 



18-609 

 18-509 

 18-709 



18-583 

 18-584 

 18-585 





18-609 



18-625 





18-709 



18623 





18-509 



18-625 





Mean Resistan 



ce 18-609 ohms 



* This consists in drawing a little mercury from one limb to the other. 



Tube A was fitted with rubber plugs. Tubes B and 

 were cemented to the side-limbs and the results obtained 

 with them were more concordant. 



