186 FEEDING WITH SUGAR BEETS, SUGAR, ETC. 



their dryer should be 110 C., which is sufficient to prevent the 

 condensation of water without in any way destroying the ulti- 

 mate value of the dried cossettes. By lengthening the time 

 that the cossettes remain in the dryer one may obtain any de- 

 Complete drying g re e of dry ness that the occasion may call for. It would be 



unnecessary. p Oss ibi e to evaporate their water completely. However, this 

 would be unnecessary, as the dry residuum would re-absorb 12 

 per cent, to 15 per cent, of moisture when coming in contact 

 with the air. Buttner and Meyer do not go beyond a limit of 

 88 per cent, of dry matter, which corresponds with that of hay 

 and other dry forage. 



In order to regulate the temperature of the furnace and the 

 exit of the gases, special appliances are arranged on the dryer 

 permitting the air to enter in such quantities as circumstances 

 may demand. 



Regulating the It is to be noticed that the amount of cossettes entering a 

 dryer. furnace is an important factor as regards the final temperature 

 of the gases. The smaller the volume of cossettes in the dryer 

 the greater the tendency of the temperature to rise. This may 

 be readily explained, as then a large portion of the caloric is 

 not utilized for the evaporation of the water of the cossettes. 

 The working of the dryer and the suction of the air should be 

 regulated so as to correspond with the entrance of the cossettes 

 into the apparatus. It is essential in this dryer that the suction 

 of air should be regulated so as to correspond to the volume of 

 cossettes being dried; excess w 7 ould always mean a fall of tem- 

 perature. The variations of temperature are very slight in the 

 Buttner and Meyer furnace owing to the considerable mass of 

 masonry of which the dryer consists, which within itself consti- 

 tutes a sort of a heat regulator. The initial and final temper- 

 ature of the gases are two facts that are most important to watch. 

 The first can oscillate within the limit from 200 to 300, and 

 have, evidently, an enormous importance. An excessively low 

 temperature would mean that too much air had been mixed 

 with the hot gases, and there is no question but that it is 

 far better to use directly the caloric of the fuel to evaporate 

 water than to re-heat the air; the higher the initial temperature 

 the greater will be the economical working of the dryer. 



