THE ASSAY OF SUGAR HOUSE PRODUCTS. 



determined by the refractometer ; the percentage of fibre is then the quantity 

 100 per cent, water per cent, total solids. This calculation and method 

 is of course applicable to cane also. 



Analysis of the Juice. The general methods for determination of 

 density, degree Brix, total solids, have been already given in this Chapter ; the 

 actual routine of the determinations is here described. 



Degree Brix. The actual practice of taking the degree Brix or total 

 solids is as follows : If juice from the mill bed is being analysed, the sample 

 is poured into a cylinder about twelve inches high by three inches diameter ; 

 this cylinder is provided at the bottom with a tubulure, in which is fitted a 



perforated cork carrying a bent 

 piece of glass tubing, which may 

 be closed by a piece of india- 

 rubber tubing and a clip; such 

 cylinders with draw-off cocks 

 ground in may be obtained at a 

 small price from dealers in ap- 

 paratus. The sample is allowed 

 to stand for about five minutes, 

 when the air bubbles will have 

 risen to the surface and the dirt 

 have sunk to the bottom ; a clear 

 negotiable sample can then be 

 drawn off into a second cylinder, 

 the hydrometer inserted, allowed 

 to come to rest and the degree 

 Brix noted ; the temperature is 

 taken at the moment of obser- 

 vation ; for each degree Pahren- 

 heit above or below that at which 

 the hydrometer is graduated -035 



of a degree Brix should be added or subtracted. The preservation of samples 

 for analysis is referred to in Chapter XXIV. 



The apparatus for taking the density of the juices may conveniently be 

 arranged as shown in Fig. 263 ; it is a shallow tray two feet square, lined with 

 lead, from which leads a pipe to carry off waste ; a tap for a water supply is 

 arranged over the tray, by means of which a current of water is always 

 available for cleaning apparatus and for cooling hot juices. Over the tray is 

 placed a shelf in which are pierced a number of holes by means of which 

 apparatus may be hung downwards to drain ; the shelf also serves as a stand 

 for cylinders in which the juice is settled. By the use of an arrangement like 



479 



