On the following morning it was raining, not exactly cats and dogs, but a drizzly, misty, damp—very damp—sort of rain. I did not care very much for rain, though, especially as it made no difference, when once in the tunnel, what the outside weather might be. When breakfast was over, I started for the tunnel under the escort of the proprietor of the hotel.
VISITING THE TUNNEL.
The western portal of the tunnel is two miles south of the village. The road leading to it is among some small hills that appear trying to hug the mountain. Mr. Haupt began his work on this side of the mountain, in a limestone rock, from which he expected to pass directly into the solid primary rock, forming the base of the mountain; but to his surprise and mortification, his hopes were not realized.
DEMORALIZED ROCK.
Instead of reaching the solid rock, he entered into a mass that is known as demoralized rock, a sort of combination of mica, quicksand, water, and everything else that is disagreeable. It was perfectly unmanageable. As fast as they dug it out it flowed in. Imagine a mouse attempting to construct a tunnel through a barrel of swill, and you can form a very good idea of the difficulty of working in this rock. You might as well attempt to make a tunnel through a thousand cart-loads of soft mud; in fact, you could get along easier in the mud than in this demoralized rock, because you could take precautions against the flowing in of the mud, which you could not take against this disintegrated mica. It is a sort of soft stuff which French miners denominate “moutarde,” and English miners allude to as “porridge.”
In order to escape this porridge, the engineer tried to make a tunnel farther up the hill-side; but it was of no use. There was the stuff again, and somehow it must be met. Not only was it impossible to prevent its caving in, but it was necessary to prevent its rising upward. Consequently an arch must be made below, as well as above; in fact, it was necessary to construct the brick-work in such a way that it would form, when completed, a perfect cylinder, as the pressure of the porridge would be exerted in all directions. As the work was put forward and completed, a casing of timber was made, and inside this casing of timber the brick arch of the tunnel was built.
EASTERN ENTRANCE.