THE LIME-LIGHT 49 



ing movements described under the mixed jet are often ap- 

 plied to them. 



The c form is less common. Here the hydrogen flame 

 comes from an open perpendicular nozzle, and the oxygen is 

 blown across it. This form of jet gives larger wings of hy- 

 drogen flame outside the jet which plays upon the lime, and 

 consequently heats the lantern more ; but it is impossible to 

 ' snap ' it, as the hydrogen cannot get down the oxygen tube. 



In the D form, a dome with a smaller orifice contracts the 

 hydrogen flame, through which the oxygen is blown. The 



FIG. 31. Oxy-gas Jet 



consequence is a better mixture, a smaller flame, and when 

 properly adjusted a better light ; but this form, like A and B, 

 is liable to ' snap ' unless the oxygen has a bye-pass. Perhaps 

 it can hardly be called absolutely a ' safety ' jet, as it mani- 

 festly approaches somewhat to the ' mixed ' character. It is 

 barely conceivable that under some conditions a mixture 

 might occur sufficient to cause a violent snap ; but I never 

 heard of such an accident occurring. This is probably the 

 form that an experienced operator would prefer to use, for 

 its more contracted flame and better light. The best form 

 for a novice is c. 



* E 



