394 



Prof. B. Moore and Mr. H. E. Eoaf. 



[Apr. 12, 



The hot- water jacket was made watertight below by means of an 

 india-rubber cork, us shown (fig. 2); the rubber cork whs also bored 

 in each case for two narrow glass tubes, for the purpose of carrying 



Pig. 2. — Section taken through the upper portion of one tube of the differential 

 Densimeter and the hot-water jacket, showing the inflow and outflow tubes. 

 Scale |. 



water to and from the jacket. The two tubes carrying the water in, 

 stopped about 2 cm. above the upper surface of the rubber cork in 

 each tube, so as to prevent blocking by mercury accidentally run over 

 from the top when the inner tubes were being cleared out at the 

 termination of a measurement. The outer ends of these two tubes 



