8 



A MOISTURE TESTER FOR GRAIN. 



removable supports, as shown in figures 2 and G. This form of sup- 

 port provides a good asbestos ring on which the flask rests, exposes 



the bottom of the flask more 

 uniformly to the action of the 

 heat, and at the same time is so 

 made that a sufficient quantity 

 of heat comes in contact with 

 the upper part of the flask. 



In adjusting these supports 

 the asbestos ring in the top of 

 the support should be cut so 

 that tlie bottom of the flask will 

 be not less than three-eighths of 



Fig. 6.— Flask support. • i i i x 



an mch above the asbestos cen- 

 ter of the wire gauze, as shown in figure 2. The support should be 

 1| inches high. 



WIRE GAUZE. 



The wire gauze in the bottom of each compartment between the 



*?2'"'^, 



/ 



flask and the flame should 

 ^' be kept in good condition, 

 -'^- so that the flame does not 

 play directly on the bottom 

 of the flask. This gauze 

 should be made of iron ^vire, 

 from sixteen to twenty 

 thousandths of an inch in 

 diameter, w^ith 20 wires to 

 the inch and with a 2-inch 

 asbestos center, as shown 

 in figure 7. 



The asbestos center in- 

 sures a more uniform dis- 



FiG. 7. — Wire gauze with asbestos center. 



tribution of heat and adds greatly to the life of the wire. 

 It can readily be put in by mixing asbestos cement with 

 water and rubbing it into the mesh of the gauze. 



CONDENSER TUBES. 



The o-lass condenser tubes, with dimensions as shown 

 in figure 8, should be so adjusted in the No. 5 rubber 

 stoppers that when the latter are firmly pressed into 

 the holes in the bottom of the cold-water tank the tops 



of the tubes will be approximately one-fourth of an inch above 



the top of the tank. 



[Cir. 72] 



..1..])^ 



Fig. 8.— Con- 

 denser tube. 



