24 
ME, EGBERT MALLET ON VOLCANIC ENEEGY. 
Weight of Quartz crushed per 24 hours by one stamp-head. 
(1) 
lbs. . 
2016 
to 
lbs. 
7840 
Size of powder 40 to 
224 per square inch 
if) 
2240 
55 
8960 
65 „ 
144 
55 
(3) 
1680 
55 
6720 
64 „ 
130 
55 
(4) 
3360 
55 
6720 
60 „ 
140 
55 
(5) 
2240 
55 
8960 
64 „ 
160 
55 
(6) 
2800 
55 
3360 
100 „ 
121 
55 
(7) 
3360 
55 
4592 
70 
250 
55 
Average 
2528 
to 
6736 
Average 66*143 to 
167*000 
55 
General average 4632 lbs. General average 116*571 per square inch. 
Horse-power given to work each head. 
(1) 
H.P. 
1*00 
to 
H.P. 1 
1*50 
(^) 
0*75 
55 
2*00 
(3) 
0*75 
55 
1*00 
(4) 
0*83 
55 
1*75 . 
(5) 
0*50 
55 
2*00 
(6) 
0*60 
5 * 
1*50 
(7) 
0*83 
55 
1*87 
Average 
0*7514 
to 
1*66 , 
General 
average =1*2057 
II. P. 
Actual specific gravity of Victorian Gold Quartz from Royal School of Mines: — 
By their determination . . . =2*6307 
By Mallet’s determination . . =2*6224 
Actual of Wicklow Quartz (Brett) : 
Mallet’s =2 *6 214. 
This is but a mere contrast as regards the conclusions here sought for. 
Specific gravity of quartz on various authorities : — 
Senft (specific gravity) 
Z I REEL „ 
KlRWAN „ 
Beudant 
Hu AY 
55 
5 ? 
=2*5 to 2*8 1 
2*6 
2*64 to 2*67 f Average of all 2*6469 
2*641 to 2*654 
2*670 ; 
1 cubic foot of water at 60° weighing 62*5 lbs.: 
1*0000 : 62*5 :: 2*6469 : =165,431 lbs. av. 
= weight of cubic foot of quartz. 
