IO2 



MAGIC LANTERN WITH THE LIME LIGHT [Cn. IV 



time smaller cylinders with the gas at a much higher pressure (100 

 to 120 atmospheres) are employed (see also 156). In using the 

 gas it is drawn off through a reducing valve by which it can be 

 delivered at any pressure desired, and of course in any volume 

 desired. 



One should never try to use the gas without drawing it through 

 the reducing valve. The cylinders have special junctions for the 

 reducing valve, so that it is easy to make the connections. 



FIG. 57. OXYGEN CYLINDER 

 WITH COMPRESSED OXYGEN, 

 THE PRESSURE GAUGES AND 

 THE MIXED JET OR BURNER. 



(Catalogue of Schmidt and 



Haensch). 



B Tip of the nozzle of 

 the mixed jet. 



K Holder for the lime. 

 The end of the lime is used, 

 not the side as in fig. 56, 59. 

 G Handle of the stop-cock 

 for hydrogen in the tube of 

 the burner. 



S Stop-cock for oxygen. 

 // The tube conveying 

 hydrogen to the burner, steel 

 cylinder not shown. 

 O Tube conveying oxygen from the steel cylinder to the burner. 

 / The high pressure gauge giving the number of atmospheres under which 

 the gas in the cylinder is compressed. 



M The low pressure gauge to show the pressure of the gas after it has 

 passed the pressure reducing valve (St.). 



St The handle of the valve serving to open the pressure reducing apparatus. 

 V The valve of the cylinder. This must be opened to allow the compressed 

 gas to escape into the tube passing to the reducing valve and to the high pres- 

 sure gauge. It must be closed after every exhibition. 



