This note is inserted with the further and more general
purpose of calling the attention of those, especially foreigners,
who are desirous of inspecting our larger manufactories, to the
chief cause of the difficulty which frequently attends their
introduction. When the establishment is very extensive, and its
departments skilfully arranged, the exclusion of visitors arises,
not from any illiberal jealousy, nor, generally, from any desire
of concealment, which would, in most cases, be absurd, but from
the substantial inconvenience and loss of time, throughout an
entire series of well-combined operations, which must be
occasioned even by short and causual interruptions.
2. It is true that the transport of letters is not the only
object which this apparatus answers; but the transport of
passengers, which is a secondary object, does in fact put a limit
to the velocity of that of the letters, which is the primary one.
3. A proposal for such a vessel, and description of its
construction, by the author of this volume, may be found in the
Encyclopaedia Metropolitana, Art. Diving Bell.
4. The mines of Bolanos in Mexico are supplied with timber from
the adjacent mountains by a slide similar to that of Alpnach.
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