184 FEEDING WITH SUGAR BEETS, SUGAR, ETC. 



tion, on the one side of which are collected the ash, etc., that 

 have been carried forward by the circulating gases. The suction 

 of the air necessary is accomplished by the so-called exhauster, 

 and may be regulated as the occasion may demand. When this 

 is used" for the burning of peat or other poor fuel, such products 

 are first thrown upon a special grating, where they are carbon- 

 ized and fall gradually from layer to layer until completely 

 consumed. On the lower and upper portion of the dome the 

 gases are carried forward at the same time as the cossettes into 

 the dryer proper, which consists of three semi-cylindrical layers, 

 one over the other, having each a shaft that forces the spiral 

 agitators to revolve through the intervention of special conical 

 gearing placed outside the dryer. These axes revolve at a 

 velocity of 26 revolutions per minute, the cossettes are intro- 

 duced into the dryer by an endless band carrier and spiral, and 

 are deposited above the chamber of the drier. This residuum 

 passes through the apparatus, comes in contact with the hot 

 gases and is rapidly dried. As we have already described above, 

 there is no apprehension of the cossettes being carbonized, as 

 the evaporation of the water they contain is not sufficiently 

 rapid to prevent their reaching a temperature of 100 C., and 

 this is a very essential condition, as above that temperature 

 Temperature of the albuminoids of the cossettes would be rendered very much 

 cossettes being less digestible. According to the experiments of Kohler the 

 dried. temperature of the cossettes in this dryer never reaches even 90 

 C., as in his laboratory oven experiments, in which the drying 

 was done at 90 C., the dried product had a coefficient of 

 digestibility less than that of the dried cossettes obtained in the 

 Buttner and Meyer furnace. 



The agitating arms of the spirals are not combined as one 

 might suppose, viz., so as to push the cossettes forward and 

 force them out at the end of the apparatus. They are, on the 

 contrary, arranged so as to compel them to circulate in the 

 opposite direction from which they entered, but owing to a cur- 

 rent of hot air they become dryer. The lighter portions are 

 carried down to the second division, where the spiral arm 

 arrangement raises them and brings them again in contact with 

 the hot air until the moment that they are carried to the lower 



