THE CONTROL OF THE FACTORY 



545 



corrections, as it is not feasible to make the determinations except at infre- 

 quent intervals. 



The error due to the suspended matter may be eliminated by regarding 

 it as juice and making the analyses on the whole material, but it is much 

 more satisfactory to make the analyses on juice from which the suspended 

 matter has been removed and to correct the recorded weight on volume of 

 juice. 



When the weight of juice is recorded from the number of tanks filled, 

 it is well to attach to each tank a counter operated by the movement of the 

 valves so as to check the record of the operator. A device such as that due 

 to Horsin-Deon, 2 is also useful to demonstrate that the tanks have been 

 properly filled and emptied, and also to serve as a counter. In this apparatus 

 (shown diagrammatically in Fig. 349) a chain, a a, transmits motion from a 



FIG. 349 



float, b, to a drum, c, which revolves as the float rises and falls. A pinion, 

 d, on this drum drives a rack, e, which carries a pencil bearing on the cylinder, 

 g, rotating once in twelve hours. 



Press Cake. In cane sugar houses the weight of press cake only averages 

 I per cent, of the cane, and sufficient accuracy is obtained by finding the 

 average weight of one cake and thus obtaining the weight from the record 

 of the presses dumped. 



Raw Sugar. This material is weighed on ordinary scales or more con- 

 veniently is filled into the bags from an automatic weighing machine, of 

 which there are several satisfactory forms on the market. These machines 

 also keep a tally of the number of bags filled. 



Molasses. The most satisfactory method is to weigh the molasses on 

 beam scales, using two tanks, one filling and one emptying. If the molasses 

 is shipped in tank cars, their contents may be determined by weight as for 

 any other material, or less accurately the average net contents of a car may 

 be determined. The measurement of molasses in storage tanks is very diffi- 



20 



