Biennial Report, Volúmenes1-21883 |
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Resultados 1-5 de 38
Página 15
... feet in diameter , giving a volume of air of fifty - one thousand cubic feet per minute ; there was considerable delay in getting the ventilation of this mine in proper shape . On my last visit , before the fan was put in , I found only ...
... feet in diameter , giving a volume of air of fifty - one thousand cubic feet per minute ; there was considerable delay in getting the ventilation of this mine in proper shape . On my last visit , before the fan was put in , I found only ...
Página 16
... cubic feet per minute . As this was the first fan in the What Cheer district , there was considerable interest manifested by other operators to know what the volume of air would be if the fan was run at two hundred revolutions per ...
... cubic feet per minute . As this was the first fan in the What Cheer district , there was considerable interest manifested by other operators to know what the volume of air would be if the fan was run at two hundred revolutions per ...
Página 17
... cubic feet per man per minute . The Rosetta mine was opened about the same time of the Musca- tine mine , and is also ventilated by a furnace , and the ventilation was good at the time of my last visit . • NOTE . Since taking the notes ...
... cubic feet per man per minute . The Rosetta mine was opened about the same time of the Musca- tine mine , and is also ventilated by a furnace , and the ventilation was good at the time of my last visit . • NOTE . Since taking the notes ...
Página 19
... feet - about three times the distance that it should be under the most favorable circumstances . The hoist- ing ... cubic feet ; there was considerable leakage of air through the stoppings in one or two places that could soon 1883. ] 19 ...
... feet - about three times the distance that it should be under the most favorable circumstances . The hoist- ing ... cubic feet ; there was considerable leakage of air through the stoppings in one or two places that could soon 1883. ] 19 ...
Página 20
... cubic feet per minute , ventilated by steam . There was no escape shaft ; I gave the company written notice to provide an escape , which they did inside of twenty days . Since my visit the property has changed hands ; it is now ...
... cubic feet per minute , ventilated by steam . There was no escape shaft ; I gave the company written notice to provide an escape , which they did inside of twenty days . Since my visit the property has changed hands ; it is now ...
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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