17, 2 
Carsten: Millable Cane 
137 
pacity, the allowable rendement will be shown to be 15.58 tons 
against 19 tons as before. The figure of 15.58 is dangerously 
near the minimum set, namely, 14.35 tons of cane per ton of 
sugar. The formula also permits the manufacturer to calculate 
the minimum quantity of a certain cane that must be milled per 
day in order to make the set profit. Thus the question whether 
grinding should or should not proceed depends upon net pro- 
ceeds and capacity (the amount of cane ground in twenty-four 
hours) ; and these two factors, namely, net proceeds and capacity, 
control the rendement allowable. The smaller the capacity of the 
central, or the smaller the quantity of cane ground per day in 
a central of any capacity, the higher the rendement must be. 
For instance, Tables 1 and 2 show that, if the juice has 15° Brix 
and a purity of 70 per cent, at least 245 tons will have to be 
ground daily in order to make the stipulated 40 per cent profit. 
Any manufacturer can calculate from this formula whether or 
not he can grind profitably under conditions as they exist in his 
central. The graphic chart (Plate 1) shows the figures much 
more plainly than does the table. 
This chart is useful in many ways. Assuming that the net 
proceeds per ton of sugar amount to 140 pesos and that the ca- 
pacity of the central is 600 tons of cane, the lines indicating 
these numbers cross at 19, showing that this is the number of 
tons of cane it will take to make 1 ton of sugar in order to clear 
the stipulated 40 per cent profit. Assuming the net proceeds 
and the rendement of the cane to be 160 pesos and 12 tons, respec- 
tively, we find that the line on the chart showing the lowest 
capacity is still well above the crossing of these two lines ; which 
means that, if the mill grinds even less than 150 tons of cane per 
day, it can still make the 40 per cent profit. On the other hand, 
with net proceeds of 140 pesos and a rendement of 14 tons, milling 
would have to be done at a rate of about 250 tons; with 130 
pesos and 14 tons rendement, 300 tons; and with the same net 
proceeds and 15 tons rendement, it must grind at least 350 tons 
per day. In other words, the poorer the cane the faster must 
grinding be done. Up to a certain point this can be regulated 
in actual practice since mill capacity, depending as it does upon 
the size of the boiling house, is fairly elastic. If the boiling 
house is slightly larger than is specified by the capacity of the 
mill, a decided advantage is gained. 
As far as establishing a standard for purity is concerned it is 
clear that it is possible to grind a cane of a purity lower than 
70 per cent, since the higher-grade cane coming in at the same 
