,
Every witness examined has given the fullest and most
satisfactory evidence of the perfect control which the conductor
has over the movement of the carriage. With the slightest
exertion it can be stopped or turned, under circumstances where
horses would be totally unmanageable.
338. Another instance may be mentioned in which the object to
be obtained is so important, that although it might be rarely
wanted, yet machinery for that purpose would justify considerable
expense. A vessel to contain men, and to be navigated at some
distance below the surface of the sea, would, in many
circumstances, be almost invaluable. Such a vessel, evidently,
could not be propelled by any engine requiring the aid of fire.
If, however, by condensing air into a liquid, and carrying it in
that state, a propelling power could be procured sufficient for
moving the vessel through a considerable space, the expense would
scarcely render its occasional employment impossible.(3*)
339. Slide of Alpnach. Amongst the forests which flank many
of the lofty mountains of Switzerland, some of the finest timber
is found in positions almost inaccessible.
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