Mining Engineers' Handbook, Volume 2Robert Peele, John Adams Church J. Wiley & sons, Incorporated, 1941 |
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Halaman 18-18
... underground notes , calculate the length and bearing of a straight line connecting the 2 wires ( see Art 9 ) ; this length should correspond closely to the similarly computed length on the surface , as a check on the underground work ...
... underground notes , calculate the length and bearing of a straight line connecting the 2 wires ( see Art 9 ) ; this length should correspond closely to the similarly computed length on the surface , as a check on the underground work ...
Halaman 23-40
... Underground and open - cut only . No reports used where less than 25 men were employed . Falls of rock or ore from ... underground . Many such accidents are preventable by selecting careful timbermen . Hand tools on surface and in open ...
... Underground and open - cut only . No reports used where less than 25 men were employed . Falls of rock or ore from ... underground . Many such accidents are preventable by selecting careful timbermen . Hand tools on surface and in open ...
Halaman 23-49
... underground workings , which may contain carbonaceous material or timber . Fires from this cause in the Penn anthracite region have cost vast sums . It is a source of danger in outcrops of coal beds , and where the caving system is used ...
... underground workings , which may contain carbonaceous material or timber . Fires from this cause in the Penn anthracite region have cost vast sums . It is a source of danger in outcrops of coal beds , and where the caving system is used ...
Isi
AND SORTING OF ORES | 15 |
ELECTRIC POWER | 16-1 |
sion Wiring | 19-1 |
Hak Cipta | |
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Istilah dan frasa umum
adjustment Aerial Tramway anthracite approx assay aver borax buckets Bur Mines capac carriers cars charge chute claim coal mines compressor concentrate conveyer copper cost crusher crushing cu ft cupel cyanide deflection diam discharge distance drill dust elev engineer explosions feed filter fire firedamp gold grade hoisting horiz intercooler labor lamp less litharge loaders loading lode long ton machine material mechanical metal method mill mineral motor operation pipe plant plate plumb-bob pump pyrite rock safety lamps sample screen shaft sheave short ton side silver sizes Sodium carbonate solution speed station steel stopes surface survey Table tape telescope temp tension tests timber tion tons Total towers track cable traction rope tramway Trans transit traverse underground usually valve vein vertical wire zinc