Make a tee as in Experiment 56, but do not cut off the closed ends. Now attach a fourth arm, as in Fig. 79, and heat and blow gently as before to work the glass into uniform condition. Cut off the closed arms at equal lengths, smooth the ends, and your four-way junction is made.

Fig. 81. Balancing Columns

Experiment 60. A Four-Arm Siphon

Make a four-arm siphon, repeat the experiments described in Experiment 57, and make others of your own.

Experiment 61. How To Make A Y

Make a tee as in Experiment 56, then make a bend about 1/2 inch from the stem on each side (Fig. 80), and your Y is complete.

Fig. 80. Making A Y