with the bulky precipitate 
centrifuge are solid and not 
forces the oil to take a deviat- 
GASTOR-OLly INDUSTRY. © 2 29 
A centrifugal machine (fig. 14) has been devised departing in some 
respects from the ordinary basket or cone centrifuge, which has been 
found quite satisfactory on a laboratory scale for removing from the 
oil large quantities of the sticky albuminlike product which on long 
standing settles from oils and which so seriously impairs the capacity 
of the filter press. This machine by removing such meal and other 
substances as are difficult to 
filter out leaves an oil with 
only a thin cloud, but which 
can be treated with fuller’s 
earth, bleached, and _ filtered 
with much greater ease than 
retained. The walls of this 
perforated, as in the laundry 
type. Avseries of baffles (fig. 
15) attached alternately to the 
wall and to the central shaft 
ing course through the centri- 
fuge, result- —— 
ing in the col- 
lection of the. 
precipitate in 
the lower por- 
tions of the 
centrifuge 
somewhat 
similar to the 
throwing out 
of moisture 
Fic, 14.—A centrifuga! separator. 
from steam 
when the latter passes through the trap or catchall in a vacuum 
entrainment. (Fig. 11.) 
The hot oil with its charge of fuller’s earth and carbon is then 
pumped through an ordinary plate-and-frame filter press, the 
cloths of which should be covered with paper in order to obviate the 
trouble and difficulty of washing out the adhering earth from the 
pores after each filtration. All that is necessary in this case is to 
wash the cloths with alkali after several runs in order to remove the 
oil without the attendant rubbing necessary to clean up the pores. 
The filter papers with their charges of earth and carbon can be lifted 
off the cloths and thrown into the solvent extractors, thus greatly 
