60 Mr. T. Tate’s Experimental Researches on the 
Here it will be observed that the liquid followed the same law 
of descent as that of the preceding experiment. 
Reducing the coke filter to the same thickness and diameter 
of orifice as in the case of the charcoal filter, we find, under the 
Same circumstances of pressure, &c., the filtering power of the 
charcoal to be 33 times that of the coke. 
Experiment XVIII. 
The filter in this experiment was stout woollen cloth. The 
liquid was distilled water. The diameter of the plate was ~>ths 
of an inch. Each half cubic inch graduation of the filter-tube 
measured on an average 1:55 inch, so that the height of the 
liquid column at the commencement of the experiment was 15°5 
inches. 
Height of é Corresp. Value of v 
column of |©rresp. time | velocity of | by formula 
liquid, dn seconds, descent, h 
Ah. T. Ve v= 208° 
10 0 
9:5 nce os sr 
9-0 22 ‘ ae 
8:5 Be aa oa 
8-0 46 ; 
Popa Ha Lenina ae 
6°5 cee 3a so 
6-0 106 ie 
o°5 a a ca 
5-0 143 te sp 
45 uae ay 1 
4-0 190 et 
35 eee SO B50 
3-0 250 : 
2-5 ie se re 
2-0 330 Ss es 
SS awe eh ara ae 
Here the results of the third and fourth columns show that 
the velocity of discharge varies according to the same law as in 
the two foregoing experiments. 
Experiment XIX. 
In this experiment the filter was sponge plugged tight into 
the bottom of the filter-tube, which was the same as that of the 
last experiment. 
