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The briquettes look well and burn satisfactorilly. While burning 
they do not fall to dust, but break up into fair-sized pieces. 
It appears that a fineness of 0 to 6 mm. is not so advantageous for 
briquetlting as oneof 0 to 4 mm. 
For this reason, it would be advisable in practice to crush the coal 
down to 4mm. in a desintegrator before briquetting, whereby it is quite 
possible that a smaller quantity of pitch than that previously stated 
would ba sufficient to turn out good briquettes. 
Test, n,2, -~ on coal marked B, B. (*) 
The appearance of this coal is far better than that in test n. I as, 
the pure coal appears to the greater extent in lumps. 
It was therefore evident that the coal did not require such fine 
crushing as that in test No. 1, but one could assume that itcould be 
trealed straight away in a coarse condition. 
Afler washing away first of all theclay, which, however, could in 
practice be kept away from the coal, the material was passed through a 
ten millimeters screen. Both the coal above, and that below, ten mil- 
limeter size was then washed in a two-compartment washer. 
From thecoal above ten millimeter size were obtained : 52.31 °/, of 
coal and 22.96 °/, of shale. 
From the coal under 10 mm.: 15.15 °/, of coal and 9.5% °/, shale. 
Total 67.50 °/, of coal and 32.50 °/y of shale. 
On determining the percentage of ash in the coal above 10 mm. 
(18.7 °/,) it was found that it was too high to enable the coal to be 
immediatelly utilized. 
Later tests showed that a sufficiently pure coal can not be obtained 
when crushed firstly to below 20 mm., in consequence of which 
the test was therefore started afresh, and the whole of the coal scre- 
ened off with 20 mm. and the coarse coal above 20 mm. crushed down 
to below 20 mm. 
All crushed coal was then screened off with 10 mm. and the sizes 
20 to 10 mm.and below 10 mm. each treated separately on washers, 
(‘) Barro Branco hed. 
