...may conjecture the hidden perils of all such accumulations. A four-inch metallic pipe was conducted from the bottom of the pit to the surface of the ground and a few feet above it, where, a light being applied, a hissing streamer of flame flashed forth and...

...may conjecture the hidden perils of all such accumulations. A four-inch metallic pipe was conducted from the bottom of the pit to the surface of the ground and a few feet above it, where, a light being applied, a hissing streamer of flame flashed forth and...

...natural drainage enough to prevent water standing within 3 feet of the surface. Mark out a parellelogram of the proportions 2x3, the length running east and...boards to both sides of the joists above ground, and fill the space between with well rammed tan. You have now a pit the top of which slopes to the south...

...corner, drive into the earth a 3 x 4 joist; those on the back, 5£ feet long, on the front. •i£; this will leave them 18 and 6 inches respectively...boards to both sides of the joists above ground, and fill the space between with well rammed tan. You have now a pit the top of which slopes to the south...

...a striking example of the danger of all such accumulations. A four-inch metallic pipe was conducted from the bottom of the pit to the surface of the ground and a few feet above it, when, a light being applied, a hissing streamer of flame flashed forth and...

...striking example of the danger of all such accumulations. A four- inch metallic pipe was conducted from the bottom of the pit to the surface of the ground and a few feet above it, when, a light being applied, a hissing streamer of flame flashed forth and...

...all an example, not of sudden eruption, but of continuous issue. A five-inch metal pipe is brought from the bottom of the pit to the surface of the ground, as a conduit of fire-damp: underground it reaches to an insulated portion of the coal strata of about...