ON Till-: ABSOLUTE EXPANSION OF MERCURY. 



19 



]>! day. A leak in one of the oopper-braBdd joints was suspected, hut on dismounting 

 the apparatus it was found that one of the solid drawn steel tuhes had apparently 

 split in the process of manufacture, and had heen brazed up with ordinary spelter hy 

 the makers so skilfully that the flaw had escaped detection when the apparatus was 

 put together. In process of time the hot mercury had naturally found its way 

 through the hrass. A completely new set of steel tuhes was accordingly fitted, which 

 occasioned a good deal of delay. Owing to the pressure of other duties, the apparatus 

 could not l>e got ready for work again till the end of June. 



Series II. Obsercat,,,,,*, 187 C. to 300 C. 



II -' 



