The galvanometric part, composed of the needles and mirror,
therefore remains entirely free, thus allowing of its being verified,
and making it convenient to attach the silken fiber. Mr. Carpentier
has, moreover, adopted for all the minor apparatus a transparent
celluloid scale which simplifies them, facilitates observations, and
renders the use of reflection almost industrial.
We shall complete our enumeration of the measuring apparatus by citing
Ducretet's non-oscillating galvanometer, Sir William Thomson's
amperemeters, voltameters, ohmmeters, and mhosmeters, constructed and
exhibited by Breguet, and a new aperiodic galvanoscope of Mr. Maiche.
Mr. Baudot exhibited the recent improvements that he has made in his
multiplex printing telegraph, and M. Boudet of Paris showed a new
system of telephone transmission by submarine cables.
[Illustration: FIG. 1.--DIAGRAM EXHIBITING THE ARRANGEMENT FOR
TELEPHONIC TRANSMISSIONS WITHOUT A RECEIVER.]
Finally, we shall conclude our enumeration by referring to the
curiosities. The house of Siemens exhibited a miniature electric
railway actuated by a new model of Reynier accumulators; M. Maiche
operated a system of musical telephonic auditions that differed only
in detail from those instituted by Mr. Ader at the exhibition of 1881;
and Mr. Hospitalier presented a new form of an experiment devised by
Mr. Giltay, consisting of a telephonic transmission of sounds without
the use of receivers.
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