Biennial Report, Volúmenes1-21883 |
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Resultados 1-5 de 71
Página 11
... less he heeds them , and seems to rely more on his judgment than on timbers for the sup- port of the roof of his working - place . Some advocate the enactment of laws for the punishment , by im- prisonment , or infliction of severe ...
... less he heeds them , and seems to rely more on his judgment than on timbers for the sup- port of the roof of his working - place . Some advocate the enactment of laws for the punishment , by im- prisonment , or infliction of severe ...
Página 24
... less , but the pockets of coal being so small , and the territory to be prospected so large , so many holes would have to be drilled before coal would be found , that the cost would over - run the profit , as railroad transporta- tion ...
... less , but the pockets of coal being so small , and the territory to be prospected so large , so many holes would have to be drilled before coal would be found , that the cost would over - run the profit , as railroad transporta- tion ...
Página 26
... less , when the floor of the coal will commence to elevate , and the coal getting gradually thinner until it becomes too thin to work , or is wanting altogether ; and as the coal loses its thickness back in the hill , the roof gets ...
... less , when the floor of the coal will commence to elevate , and the coal getting gradually thinner until it becomes too thin to work , or is wanting altogether ; and as the coal loses its thickness back in the hill , the roof gets ...
Página 45
... less money , as the dirt can be hoisted sconer and the sinkers will not be compelled to wait on the machinery to take the dirt out of their way . The timbers for securing the shaft should all be on the ground be- fore the sinking ...
... less money , as the dirt can be hoisted sconer and the sinkers will not be compelled to wait on the machinery to take the dirt out of their way . The timbers for securing the shaft should all be on the ground be- fore the sinking ...
Página 46
... less entry driving . But in my opinion it is a mistake , for when two entries are driven one hun- dred and fifty yards apart , then the rooms have to be driven seventy- five yards , which is too far for good results . Before the rooms ...
... less entry driving . But in my opinion it is a mistake , for when two entries are driven one hun- dred and fifty yards apart , then the rooms have to be driven seventy- five yards , which is too far for good results . Before the rooms ...
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Términos y frases comunes
accident air-way Albia Angus appointed bituminous coal Bituminous shales black-damp Blue sand shales Boone county Boonesboro cage carbonic acid cause charge Coal and Mining Coal Company coal measures coal mines comply condition Coroner court creek cubic feet Dark death district dollars Drift deposit duties engine entry escape shaft examination feet per minute five furnace furnish Governor Gray clay shales hoisting shaft hole hundred feet Impure inches inspection inspector of mines jurors Kalo Keokuk county Kirkville labor Light limestone located Lucas county machinery Mahaska county map or plan MCELHANY miles miners mining boss Mining Company mining law Moines river oaths do say opening Oskaloosa Ottumwa owner or agent persons employed Polk county pressure proper railroad rock roof safety safety-lamp sandstone shaft or slope side superintendent therein thereof thickness thousand tion underground ventilation volume of air Wapello county William