CHEMISTRY. 



89 



5- to 



I. a 



Hi "5) 



By similar processes he has also liquefied the 

 other "permanent gases," so called. 

 The agencies employed by Cailletet are low 



duced through the funnel G, the lower orifice 

 of which is opened and closed by a screw 

 worked by the small wheel 0. A piston, 



temperature and mechanical pressure. The worked by the large wheel, compresses the 

 steel cylinder B B is filled with water, intro- water in the cylinder. The water in the cylin- 



