Glass Working Exercises 



105 



and proceed exactly as in the previous exercise, at the outer side of 

 the angle of the V. Introduce the tail piece and finish off as before. 



EXERCISE 9. To make an X piece. 



Proceed as in the T piece, Exercise 7, save that instead of 

 working the cylindrical junction at right angles, it should be worked 

 out at a more acute angle. Having sealed in one piece, commence 

 the second a little further down on the opposite side, in order to 

 give the two inserted pieces a common axis. The two junction 

 points may be indicated before the insertion of either, but a better 

 way is to insert one completely before commencing the second, in 

 order to accommodate it better to the angle of the first (Fig. 93). 



FIG. 93. Stages in the construction of an oblique X-piece. 



Before commencing the work all four tubes should be prepared, 

 and cooled, so that they may be conveniently handled in any place 

 or position. 



EXERCISE 10. To make a "Barker's mill" 



Make a T piece as in Exercise 7. Join a second limb opposite 

 the first. Join in two tubes at the junction, opposite each other, 

 in a straight line, but at right angles to the plane of the other four. 

 Pull out the four arms, as in Exercise I, to form jets, and while soft 

 twist them each round in the same direction. See Fig. 94 (). 



Draw out one of the last inserted two tubes about 3 cm. from 

 the junction, and close the tip into a strong point. 



To the remaining upright tube, seal a piece of 3-cm. diameter 

 tubing about 50 cm. long, and round, or " border," the upper edge 



