The arrangements for this part of the operation were
extremely simple. From the lower end of the slide to the upper
end, where the trees were introduced, workmen were posted at
regular distances, and as soon as everything was ready, the
workman at the lower end of the slide cried out to the one above
him, 'Lachez' (let go). The cry was repeated from one to another.
and reached the top of the slide in three minutes. The workmen at
the top of the slide then cried out to the one below him, 'Il
vient' (it comes), and the tree was instantly launched down the
slide, preceded by the cry which was repeated from post to post.
As soon as the tree had reached thebottom, and plunged into the
lake, the cry of lachez was repeated as before, and a new tree
was launched in a similar manner. By these means a tree descended
every five or six minutes, provided no accident happened to the
slide, which sometimes took place, but which was instantly
repaired when it did.
In order to shew the enormous force which the trees acquired
from the great velocity of their descent, M. Rupp made
arrangements for causing some of the trees to spring from the
slide.
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