The most skilful individuals, however,
considered it quite impracticable to avail themselves of such
inaccessible stores. It was not till the end of 1816, that M.
Rupp, and three Swiss gentlemen, entertaining more sanguine
hopes, purchased a certain extent of the forests, and began the
construction of the slide, which was completed in the spring of
1818.
The Slide of Alpnach is formed entirely of about 25,000 large
pine trees, deprived of their bark, and united together in a very
ingenious manner, without the aid of iron. It occupied about 160
workmen during eighteen months, and cost nearly 100,000 francs,
or L4,250. It is about three leagues, or 44,000 English feet
long, and terminates in the Lake of Lucerne. It has the form of a
trough, about six feet broad, and from three to six feet deep.
Its bottom is formed of three trees, the middle one of which has
a groove cut out in the direction of its length, for receiving
small rills of water, which are conducted into it from various
places, for the purpose of diminishing the friction. The whole of
the slide is sustained by about 2,000 supports; and in many
places it is attached, in a very ingenious manner, to the rugged
precipices of granite.
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