"It is certain that the increased temperature in coal mines depends upon the barometric pressure.

There are gases in the earth which may be ignited, and there are combustible materials as we see in the volcanoes; but if we came across anything of the sort in our borings, we could turn a river or two down the shaft, and get the better of it in that fashion." "It would be rather awkward if the other end of your shaft came out under the Pacific Ocean," said Robert, choking down his inclination to laugh.
"I have had estimates and calculations from the first living engineers--French, English, and American.

The point of exit of the tunnel could be calculated to the yard.

That portfolio in the corner is full of sections, plans, and diagrams.

I have agents employed in buying up land, and if all goes well, we may get to work in the autumn.