10] 



GLASS MANIPULATION 



5 



tube, as described above, break off the tube at a (fig. 6), 

 place one end of the wire in the thin tube so left, and heat 

 until the glass fuses round the end of the wire. Allow to 



cr 



Fig. 8 



cool. The glass tube will form a convenient handle for 

 holding the wire during heating. Bend the free end of the 

 wire into a loop, when it will be ready for use (fig. 8). 



8. Boring Corks. — Corks are readily bored by means 

 of sharpened brass tubes. Select a borer slightly less in dia- 

 meter than the size of the glass tube to be inserted. Press 

 the Gork against a wooden surface and gently rotate the borer 

 until a clean hole is 

 cut (fig. 9). To make 

 the hole smooth a 

 round file should be 

 used, which will also 

 increase the dia- 

 meter of the hole. 



9. In boring rub- 

 ber corks a very sharp 

 borer should be used, and the borer should be moistened 

 with glycerine. 



The cork borers can readily be sharpened by a special 

 kind of knife sold for the purpose, or they may be filed in 

 the interior by a round file, and on the exterior by a tri- 

 angular file. 



10. Fitting up Wash-bottle.— Select a thin 18 oz. 

 conical flask (fig. 10). Procure a good, sound cork, free 

 from flaws or cracks, slightly larger than the inner diameter 

 of the neck. Soften the cork by rolling it backwards and 

 forwards under the sole of the foot on the floor : this will 

 somewhat lessen the diameter of the cork and ensure a 

 good fit. 



Fig. 9 



