Publisher's Synopsis
Excerpt from Methane Accumulations From Interrupted Ventilation: With Special Reference to Coal Mines in Illinois and Indiana
The mining laws Of many States provide that when ventilation is interrupted in mines in which methane is generated the men. In the workings affected, especially if open lights are used there, shall be gotten out as quickly as possible. There are many mines or sections Of a mine in which only a small quantity Of methane is generated and where, under regular conditions of ventilation, it is so diffused with the air as not to be detectable with a safety lamp. These places are considered nongaseous and Often no concern is felt if the ventilation is interrupted even for several hours at a time. That locally in such mines there may be dangerous accumulations of methane within a short time if the air current is stopped is indi cated by the tests described in this paper.
In three mines, two in southern Illinois and one in Indiana, samples Of mine air were collected and analyzed from working places where no methane had been reported by the mine examiner. By stopping the air current during the tests any accumulation Of methane through this interrupted ventilation was detected. The results show a8 methane accumulations from interrupted ventilation.
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