GLASS BLOW-TORCH FOR BLOWPIPE ANALYSIS C. H. ALMPELTAND C. C. BEEBE, SYRACUSE UNIVERSITY, SYRACUSE, NEWYORK
This simple blow-torch is made of 9-mm. pyrex tubing (F), 16 cm. in length, which is drawn to a 2-mm. opening on the one end. At 5 cm. from the other end a piece of 4-mm. pyrex tubing ( K ) is sealed on and bent as shown in sketch. Next a brass blowpipe (C) is taken and the small end is cut off just inside the bend. The large end is cut off according to the length desired. Around the large end is placed a piece of pure gum tubing (D)which serves to hold the brass tube tight inside the pyrex tube; this also serves as an air plug. The air exit (J) of the brass tube (C) comes to within 3 mm. of the opening in the pyrex tube (H) and must be exactly centered to (H). This centering is done a t (G) where the tube is heated and three equally spaced file punches are made, thus centering the brass
-r A-Mouthpiece B-Pure gum tubing 4 mm. C-Brass blowpipe barrel (for air) D-Pure gum tubing 4 mm. F-Pyrex tubing 9 mm.
G-Centering points II-Gas exit J-Air exit K-Pyrex tubing 4 mm. (for gas) M-Red burner tubing
tube (C) and also leaving room for the passing of gas lrom (K) to (H). Fastened to (C) is a piece of pure gum tubing which varies in length as desired. On the end of the tubing is a mouthpiece ( A ) made by endflattening a piece of 4-mm. glass tubing. Fastened to (I
