tins in which the crude oii is supplied. The shape is that of ate 
with two spouts, one at each end, and is shown in the drawing 
It will be noticed that the spouts do not arise from the centre of the 
ends of the drum, but from one edge of them ; are directly oppose 
to one another, and are numbered A and 13 . On the spout B a 
weight is suspended. All joints arc soldered. 
In A a sand filter is placed. This consists of a glass tube, with 
an internal diameter of one centimetre, containing sand. The tube 
passes through a cork which is pressed home in the spout. To mate 
the sand filter :— Draw out some tubing to a point and cut off so that 
the lumen is about half a centimetre in diameter. Place a small plug 
of glass wool in the neck so formed and fill up two inches of the tube 
with fine sand. Then place another small plug of asbestos wool arc 
again draw out the tube round it and cut off. 
I he whole apparatus should now be tested to see if it is tighi 
To complete it, a piece of galvanized iron wire is fastened to each 
spout, each piece being about two feet in length. The two pieces 
are joined together above, and from their junction a wire passe: 
upwards which must be long enough to reach from nearly the bottom 
of the cesspool to the manhole door. This appliance when filled with 
water will immediately sink, assuming a horizontal position under 
'vater; but when filled with oil, would float were it not for the weight 
on the spout B. Consequently, when filled with oil and dropped into 
'va er, it will sink to the bottom, but the end A will be pointing 
o? P anc | t ^ e °if will pass out through the sand filter at the rate 
Q f 0 jj CU * c cem, nietres a day. The oilers hold nearly 3 j l' tre: 
A mil ic a.- ^ °^ cr 111 a cesspool the following procedure is adopted 
oiler is held'^ ^ Wa ^ of t * ie manhole just under the lid The 
means of a f " ** t * le s P 0llt B upwards and oil is poured into it b) 
ground with rh ^ ^ ^ en it is allowed to rest horizontally on the 
The anna t SP ° UtS ^ t0P S ° that little or no oil is s P illed ( F «* ^ 
cesspool until if U f ^ ra ' Sec ^ ^ le w *re and lowered gently into the 
water is reached °u C ^ Water It: remains horizontal until the 
it sinks under th W ^ ,mme ^ ate Iy assumes its vertical position a- 
air-bubbles comin *" 2 ) No oil will pass out until the 
of oil begins. ^ ° Ut ° the end A have ceased, when the exudation 
