186 DIFFERENT LIQUIDS IN COMMUNICATING VESSELS. 



will be considered further on. The narrower vessel for these experi- 

 ments must therefore be wider than l cm , and the internal diameter 

 of the wider vessel should be considerably greater. To form it, the 

 narrower portion may be cut from the cylinder of a moderatoi 

 lamp and closed at one end by a cork through which one end of a 

 glass tube is passed, the tube having been bent twice, as shown in 

 fig. 134, A. The other end of the tube is passed through the cor 

 of the wider vessel, which may be procured by cutting away the 



FIG. 134 (an. proj. real size). 



bottom of a common glass bottle. The corks should be firmly fixed 

 in the vessels with sealingwax. The apparatus is rather fragile and 

 not easily placed in a convenient position for use. Fig. 134, A, 

 shows a suitable manner of supporting the whole : the horizontal 

 portion of the connecting tube rests upon the foot-board of the re- 

 tort-stand, the narrower vessel is clamped in the fork, and the wider 

 vessel is tied to the fork with twine. The whole is more easily 

 arranged if it be not required that the heights of the same liquid 

 should be precisely equal in both vessels, or those of different 

 liquids precisely in the inverse ratio of their specific gravities. In 

 this case the lamp-cylinder may be nsed as the wider, and a 

 glass tube from 6 to S** wide as the narrower vessel, both being 

 connected as shown in fig. 134, B. Tubes having an internal width 

 of l cm cannot be well bent over a common lamp ; a narrower one 

 must therefore be used. In such a tube the water will have a 



