...a strait work is driven in coal, which is a small subterranean tunnel 6 feet high and 4 feet wide, the rising of the floor is a more usual and far more...which a man was not to approach personally within 20 inches or 2 feet. To no one had it then occurred that width at the bottom of a drain was a great...

...a strait work is driven in coal, which is a small subterranean tunnel 6 feet high and 4 feet wide, the rising of the floor is a more usual and far more...which a man was not to approach personally within 20 inches or 2 feet. To no one had it then occurred that width at the bottom of a drain was a great...

...floor is a more usual and far more inconvenient occurrence than the falling of the roof: the %veight of the two sides squeezes up the floor. We have seen...which a man was not to approach personally within 20 inches or 2 feet. To no one had it then occurred that width at the bottom of a drain was a great...

...collieries is aware that when a strait work (which is a small subterranean tunnel 6 feet high and 4 feet wide or thereabouts) is driven in coal, the rising...which a man was not to approach personally within 20 inches or 2 feet. To no one had it then occurred that width at the bottom of the drain was a great...

...collieries is aware that when a strait work (which is a small subterranean tunnel 6 feet high and 4 feet wide or thereabouts) is driven in coal, the rising...which a man was not to approach personally within 20 inches or 2 feet. To no one had it then occurred that width at the bottom of the drain was a great...

...straight work is driven in coal, which is a small subterranean tunnel six feet high and four feet wide, the rising of the floor is a more usual and far more...one had it then occurred that width at the bottom of a drain was a great evil. For the convenience of the operator the drain was formed with nearly perpendicular...

...strait woik (which is a small subterranean tunnel six feet high and four feet wide, or thereabout) is driven in coal, the rising of the floor is a more...one had it then occurred that width at the bottom of a drain was a great evil. For the convenience of the operator the drain was formed with nearly perpendicular...

...strait work (which is a small subterranean tunnel six feet high and four feet wide, or thereabout) is driven in coal, the rising of the floor is a more...one had it then occurred that width at the bottom of a drain was a great evil. For the convenience of the operator the drain was formed with nearly perpendicular...

...strai1. woik (which is a small subterranean tunnel six feet high and four feet wide, or thereabout) is driven in coal, the rising of the floor is a more...one had it then occurred that width at the bottom of a drain was a great evil. For the convenience of the operator the drain was formed with nearly perpendicular...

...more inconvenient occurrence than the falling of the roof: the weight of the two sides squeezes up che floor. We have seen it formed into a very decided...till recently dreamed of forming a tile drain, the bottom-of which a man was not to approach personally within twenty inches or-two feet . To no one had...