[Illustration: FIG. 3.--RECEIVER TAKEN APART.]

In certain applications, of course, the receivers may be combined with a
microphone; yet on an aerial as well as on a subterranean line the
transmitter produces effects which, as regards intensity and clearness,
are comparable with those of a pile transmitter.

Stations wholly magnetic may be established by adding to the transmitter
and two receivers a Sieur phonic call, which will actuate them
powerfully, and cause them to produce a noise loud enough for a call. It
would be interesting to try this telephone on a city line, and to a
great distance on those telegraph lines that are provided with the Van
Rysselberghe system. Excellent results would certainly be obtained, for,
as we have recently been enabled to ascertain, the voice has a
remarkable intensity in this telephone, while at the same time perfectly
preserving its quality.--_La Nature_.

* * * * *

[NATURE.]




THE MELDOMETER.


The apparatus which I propose to call by the above name
([mu][epsilon][lambda][delta][omega], to melt) consists of an adjunct to