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Having determined the coordinates of the two wires by a closed surface traverse , set up underground at a station as far from wire No 1 as it can be plainly seen , and sight the mean position of the wire . This operation need not be ...
38 261 I 157 565 442 154 .21 16.40 Open - cut , hand loading only . 173 39 352 227 3.21 22.45 Total ..... 311 251 7 818 227 31 104 77 4 936 1. 24 79.38 ( a ) Underground and open - cut only . No reports used where less than 25 men were ...
DUMPING HOT ASHES in open pits connected with 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 ...
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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