At 2.50 to 3 metres distance from the exterior border, sink a mining hole about 5 ... This cylinder is fixed to an ordinary mining fuse, which oes down a certain depth to insure the combustion of the power. ... When it touches the surface, hold it perfectly still, and pour sand into the hole until it is quite full; there is no need to anbsp;...
|Title||:||Annual of Scientific Discovery; Or, Year-book of Facts in Science and Art for ...|