inn 
Paper which covers the Powder and then they prime the 
Gun and lay a traine and goe up out of the work before 
the Powder comes to take fire ; the Paper is put at firft oc 
ver the Powder^ left when the Gun and ^uinet are drive- 
dowu, the tooles may ftrike fire and kindle the Powder.n 
In number : f. oi the Philofoph. Tranfadl. let forth 
by Mr. Oldenburg there is a way of breaking Rocks wkh 
Gunpowder Communicated by Sr. 'Egbert Moray, as he 
received it from Monfr. du Son the Inventor, and there 
is a draught of the Inftruments for that purpofe, but in 
regard thofe Inftruments differ in feverall things from 
thele, I thought it might not be amils if thefe were like- 
wife Inferred, , 
I know the ufe of thefe Inftruments will be of great 
advantage to Miaers,and if there are any Minerall works 
where they are not yet receiv'd, the Miners may doe well 
to try them > for ("befide what will be fav'd in timber in a 
year that is ufd in burning Rocks, which is very confide* 
rable,)we know that as foon as a man has fired his Powder 
and broken the Rock, he may prelently go to worka- 
ga;a, whereas after a fire is laid in a Shaft y a man can 
fcarce go to work in 24 hours after, the Rocks being to® 
hot to fuffer him. 
0 
JDif 
