Glass Working Bending and Blowing 83 



Taking out the plug, small grooves will be found to have 

 been filed in order to supply the smaller flames, and these may 

 either be closed with solder or opened with a file, according to 

 the change desired. 



A blowpipe should be so adjusted that the gas just remains 

 lighted when the tap is quite closed, the air being then com- 

 pletely shut off. 



The double jet of the professional glass worker is obtained 

 by opposing two ordinary gas blowpipe jets, arranging these 

 so that they just flatten against each other. They are blown 

 through a T piece from a single bellows, in order that the 



FIG. 72. Fletcher, Russell & Co.'s No. 5 blower. 



flames may be exactly similar. The use of this device at first 

 is not recommended, as there is great difficulty in obtaining 

 exactly the desired temperature, and the flame reduces the 

 glass to a workable condition too quickly for a beginner. It 

 may with advantage be used later, but for much of our work 

 it is an advantage to be able to vary the temperature and the 

 area of glass under treatment by simply moving the glass away 

 from the flame, and this is difficult to secure in the case of a 

 double jet. 



Blower. There appears to be no better blower on the 

 market than Messrs. Fletcher, Russell & Co.'s No. 5 (Fig. 72), 

 which costs about 25*. Fans, bellows, compressed air, Korting 



