Miscellaneous Intelligence. 139 
of potash; and, lastly, dried in a room heated by hot air or steam to 
about 160° Fah. It is considered probable that the use of the solutions 
of carbonate of potash and nitrate of potash may be dispensed with, 
although actual experience does not warrant such an omission. 
The patentee remarks, that nitric acid may be employed alone in the 
manufacture of explosive compounds ; but that, as far as his experience 
goes, the article, when so manufactured, is not so good and far more 
costly. 
effect as eight parts by weight of the Tower-proof gunpowder. The 
is intended—so. that, when dried, it shall retain the required figure ; 
of an inferior specific gravity may be employed. 
The patentee having thus described the nature of the invention, and 
in what manner the same is to be performed, states, that he does not 
portions, and its coarse or fine graining; powder of the same grain will 
y 
Gun-cotton is uniform in strength, and fires quicker than the finest 
gunpowder. ; 
The rock is variable in texture, and Hable to be crossed by seams 
which, if they be slight, may destroy the correctness of the result with- 
Out being discovered by the operator. 
