"I wish we could set the air shaft working," suggested Sandy.
One way is to keep a large fire at the bottom of the air shaft.
What if it were an air shaft, running to the very bottom, a hundred feet below?
The fans will be blowing that fire down this air shaft in a few minutes.
Scarcely could a man fall in such a way in an air shaft and live.
If two galleries in a mine are to be connected by an air shaft, how shall it be planned so as to save labor?
There was a scramble for the buckets, but no one offered to man the windlass and hoist them up the air shaft.
Grant looked up the air shaft and saw the fire–little flickering flames lighting up the shaft near the second level.
They reached the passage in a cloud of smoke, but it was going up the air shaft and did not fill the passage.
I'll tell you what, Em—you call down the air shaft to Cass, and tell him to send Henny up to make us a nice little coal fire here.