1. Cooling power calculated is called dry, if there is . . . . . . . .
2. If hydrometer readings taken regularly to provide an indication weather or not . . . . . . . . taking place.
3. The upper limit of inflammability of methane air mixture.
4. Synonymous of carbon monoxide reffered as
5. The gas which imitates eyes and respiratory passages.
6. The atmospheric pressure measured by an instrument . . . . . . . .
7. To make it an explosive, in which range of methane air mixture falls.
8. What happens in a mine, there is a sudden drop in barrowmetric pressure . . . . . . . .
9. The gas easily disolved by moisture in mine air
10. The temperature and humidity monitor is
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