The first will
be, for the ascending vibrations, an increase of pressure effected
between the disks of the left side, by reason of their force of
inertia being increased by that of the lead disks; and the second will
be, for the disks to the right, and, for the same reason, a reduction
of pressure which will take place through resilience, at the moment of
change in direction of the vibrating motions.
If the current from a pile, P, traverses all these disks, through the
connections that we have just mentioned, and passes through the
primary helix (through the wire, I) of an induction coil H H' (Fig.
2), located beneath the apparatus, and if the secondary current from
this bobbin corresponds, through the wire I, with a telephone line in
which there is interposed a telephone or a speaking condenser, there
will be set up an inverse induced current, which, being reversed as a
consequence of the crosswise connections of the disks, will continue
the action of the first or increase its duration, and, consequently,
its force, through the telephone receiver.
The results of this system are very good; but Dr. Herz has endeavored
to simplify it still further, and with this object in view has
experimented on several arrangements. For example, to obtain inversion
a contact was simply placed on each side of the vibrating plate.
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