A narrow cylindrical
tin case, to contain the letters, might be suspended by two
wheels rolling upon this wire; the cases being so constructed as
to enable the wheels to pass unimpeded by the fixed supports of
the wire. An endless wire of much smaller size must pass over two
drums, one at each end of the station. This wire should be
supported on rollers, fixed to the supports of the great wire,
and at a short distance below it. There would thus be two
branches of the smaller wire always accompanying the larger one;
and the attendant at either station, by turning the drum, might
cause them to move with great velocity in opposite directions. In
order to convey the cylinder which contains the letters, it would
only be necessary to attach it by a string, or by a catch, to
either of the branches of the endless wire. Thus it would be
conveyed speedily to the next station, where it would be removed
by the attendant to the commencement of the next wire, and so
forwarded. It is unnecessary to enter into the details which
this, or any similar plan, would require. The difficulties are
obvious; but if: these could be overcome, it would present many
advantages besides velocity; for if an attendant resided at each
station, the additional expense of having two or three deliveries
of letters every day, and even of sending expresses at any
moment, would be comparatively trifling; nor is it impossible
that the stretched wire might itself be available for a species
of telegraphic communication yet more rapid.
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