562 CHAPTER XXVII 



carried forward as totals periodically so that they may be reduced to correct 

 period and to-date averages are : — 



Cane. — Weight of, sugar in, fibre in. 



Bagasse. — Weight of, sugar in, fibre in, water in. 



Mixed Juice. — Weight of, gravity solids in, sugar in, polarization in. 



Added Water. — Weight of. 



Syrup. — Gravity purity of. 



Press Cake. — Weight of, sugar in. 



Sugar. — Weight of, gravity solids in, polarization in, sugar in. 



Molasses. — Weight of, gravity solids in, polarization in, sugar in. 



It will be sufficient to determine the gravity solids and sugar in the sugar 

 and molasses in a sample composited over the period. 



Simple averages of the observations relating to first and last mill juice, 

 density of syrup, purities of massecuites and process molasses, are of sufficient 

 exactitude for obtaining the average results of a period. The to-date 

 average may be obtained most readily by cross multiplication : — 



Previous to date average, seven periods, 49-0 ; current period average 



.. jx 7X4Q-0+IX5I-2 

 51-2; average to date: ^^ ^ ^ =49.3. 



Stock-takings and Balances. — Periodically* a stock and balance sheet of 

 the quantities of material worked up, of the produce made, and of stock in 

 process should be made. The time required to do this depends on the sys- 

 tematic keeping of the daily records, combined with a knowledge of the 

 capacities of the various tanks. The stock can be taken with only a few 

 minutes' delay of the mills, provided the foremen at the various stations 

 are instructed in their duties, and are supplied with forms on which they enter 

 up the material on hand when the mill is stopped. In stopping the mill 

 all that is necessary is to leave a space on the carrier between two separate 

 car loads and to stop the carrier when the cane corresponding to the end of 

 the period has passed the crusher. The resulting juice is allowed to reach 

 the measuring tanks, after which the mills are again put into operation. 



After obtaining the measurements of juice, syrup, etc., the estimate of 

 sugar obtainable is made from previous experience combined with the already 

 made routine analyses, supplemented if necessary by special analyses of 

 stock. 



In estimating the product obtainable from the pans it is well to instruct 

 the operators in advance to record the " feet " of syrup and molasses already 

 taken into the pan at the time stock is taken. In measuring the material 

 in crystallizers and mixers, it is only necessary to observe the " outage " 

 measured from the top of the container. The corresponding contents in 

 cubic feet can then be obtained at once from tabulated records. In houses 

 which work at prearranged purities in the massecuites, passage can at once 

 be made by a constant factor from cubic feet to bags of sugar and gallons 

 of molasses or to any other desired system. 



• In Hawaii it is customary to take stock and balance weekly. In Java a ten-day period, and in Cuba a fort- 

 nightly one is general. 



