Il6 AGRICULTURAL ANALYSIS 



take the apparatus apart, it is only necessary to loosen the nuts 

 and the set screw holding one wheel to the shaft and all the parts 

 can at once be removed. The posts extend 10 centimeters beyond 

 the face of the wheels, and the rings are four centimeters in inter- 

 nal diameter. Perforated plates, bearing a cross-bar, and held in 

 place by strong spiral springs attached to the plate and the base of 

 the posts serve to hold the flasks in place. Each plate has a number 

 stenciled through it for convenience in identifying the flasks 

 when it is time to remove them. Attached to the outside of each 

 post, close to the outer end, is a heavy wire which passes entirely 

 around the apparatus, serving to keep the plates in place after 

 they are removed from the flasks. 



The apparatus is mounted on a substantial framework, 36 

 centimeters high and 30 centimeters wide at the base. The space 

 in which the wheel revolves is 14 centimeters wide. The base bars 

 connecting the two sides are extended seven centimeters beyond 

 one side, and serve for the attachment of lateral bracing. At the 

 top of the framework, at one side, is attached a heavy bar 45 centi- 

 meters long, which serves to carry the cog gearing which trans- 

 mits the power. The upright shaft carries a cone pulley to pro- 

 vide for varying the speed. The usual speed is two revolutions 

 a minute for the wheel carrying the flasks. The entire apparatus 

 is made of brass. The details of construction are shown in Fig. 

 6. Round-bottomed flasks are used, and the rubber stoppers are 

 held in place by tying or a special clamp shown at the lower 

 right-hand corner of the figure. 



When high temperatures are used, the plates and flasks are 

 handled by the hooks shown at the left and right-hand upper 

 corners of the figure. 



When any other than room temperature is desired, the whole 

 apparatus is immersed in water contained in the large galvanized 

 tank forming the back-ground of the figure. The tank is 75 

 centimeters long, 75 centimeters high, and 30 centimeters wide. 

 At one end, near the top, is an extension to provide space for 

 heating the fluid in the flasks before introducing the solid, in 

 such cases as may be desired. 



