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Burrell remained in this atmos 20 min , which caused a slight headache . ... According to Lehmann , air contajning 0.07 % will cause death after 1 hr exposure ; in an experiment on a man , alarming symptoms were produced within a few ...
Handling materials other than rock or ore , underground , on surface and in open - cuts , caused 1.8 % of the deaths and ... to classify an explosion by its originating cause , others by its means of propagation ( usually coal dust ) .
Fires from this cause in the Penn anthracite region have cost vast sums . ... In coal mines they may be caused by slow oxidation in gobs and working places ; in metal mines , where there are rich sulphide ores , fires may originate by ...
Apa yang dikatakan orang - Tulis resensi
LibraryThing ReviewUlasan Pengguna - wackyvorlon - LibraryThing
I only have the second volume of this work, and I love it! Found at a local Value Village, it is filled with fascinating information. Details of all aspects of mine engineering, including compressed air, ventilation, and supporting structures. Baca ulasan lengkap
Conditions Methods in General
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