Tentang buku ini
Koleksiku
Buku di Google Play
عل
Place of occurrence of fatalities resulting from falls of roof or coal
Injuries by occupation...
Frequency and severity rates of accidents
Method of developing mines A to L
Mining methods
Mine timbering
Supervision
Testing mine roof
Mine posts and accident frequency
Details of conditions and practices in mines A to L
Mine A
Accident record
Comparative data
Roof
Floor
Mining method
Cutting and blasting
Character of falls
Page
5
7
10
11
12
13
15
16
18
19
20
22
24
25
26
27
1 The Bureau of Mines will welcome reprinting of this paper, provided the following footnote acknowledgment is used;
"Reprinted from U. S. Bureau of Mines Report of Investigations 3113."
2 Senior mining engineer, U. S. Bureau of Mines, Pittsburgh Experiment Station, Pittsburgh, Pa.
3 Mining engineer, U. S. Bureau of Mines, Intermountain Experiment Station, Salt Lake City, Utah.
4
Associate mining engineer, U. S. Bureau of Mines, Pittsburgh Experiment Station, Pittsburgh, Pa.; now Pennsylvania
Coal Mine Inspector, 30th District.