and Laboratory Methods. 



2645 



supply now used on the ordinary water-bath in chemical laboratories is sufficient. 

 The connecting tube U should be three-fourths of an inch in diameter and not 

 longer than one-fourth of an inch, placed four inches above the bottom of the 

 bath. The tube V should be one inch in diameter, extend from a point level 

 with top of bath to a point one inch below lower side of tube I', and be well 

 anchored to side of water-bath, near the top. Supply tube X, Fig. 4, sufficiently 

 large to take a one-half inch rubber tube, is inserted at aright angle into the posterior 

 side of tube V two inches from top. One-fourth of an inch from tube V tube X 

 is bent downward at an angle of 45°, this is to prevent kinking of rubber tube 

 connecting X with C. The height of the water in V is regulated by height of 

 tube W, which is either fastened in V by penetrating a cork stopper or perma- 

 nently fixed in a cap to screw on V. Tube W should extend to one inch below 



Fig. 5. — Side view of still, one-fourth scale. 



top of V, and its lower end should accommodate a one-half inch rubber tube 

 which carries waste water to a sink. 



The boiler (Figs. 1 and 5) is eight inches in diameter and ten inches high 

 from bottom to side Q, which may slope inward and upward at any desired 

 angle. The opening P to P' should be at least four inches ; walls of neck N 

 may be parallel or slightly flared at top and two inches high. At top of N a 

 heavy flange M three-fourths of an inch wide is firmly attached. The top is 

 composed of wall O which closely fits into neck N and extends about one-quarter 

 of an inch below the point P and P', with the lower edge slightly flanged inward 

 as shown in the figure, to prevent, as far as possible, capillary attraction between 

 the walls O and N. At the top of O a flange L, corresponding to flange M, is 

 firmly attached, a sufficient distance above M to admit a rubber or asbestos 

 ring. The top may then be firmly fastened to the boiler by placing several 



