SMOGRAPH.]

_Scateni's Registering Seismograph._--This apparatus, which is shown in
Figs. 7 and 8, consists of two parts--of a transmitter and of a
registering device.

[Illustration: FIG. 8.--REGISTERING APPARATUS.]

The transmitter consists of a glass vessel supported upon a steel point
and provided beneath with a platinum circle connected with a pile. All
around this circle are four strips of platinum, against one of which abuts
the circle at every movement of the glass. Each strip of platinum
communicates, through a special wire, with one of the electro-magnets of
the registering device (Fig. 8). This latter consists of an ordinary clock
that carries three concentric dials--one for minutes, one for hours, and
one for seconds. In a direction with the radii of these dials there are
four superposed levers, each of which is actuated by one of the electros.
On another hand, each dial is divided into four zones that correspond to
the four cardinal points. When a shock coming from the north, for example,
produces a contact, the corresponding electro is affected, and its lever
falls and marks upon each of the dials a point in its north zone. We thus
obtain the exact hour of the shock, as well as its direction. As may be
seen, the apparatus, as regards principle, is one of the simplest of its
kind.--_La Lumiere Electrique._

* * * * *

NEW ACCUMULATORS.

[Illustration: FIG. 1.--ARNOULD & TAMINE'S ACCUMULATOR.]

In Messrs. Arnould and Tamine's accumulators, shown in Fig. 1, the
formation is effected directly by the current, as in the Plante pile, but
the plates are formed of wires connected horizontally at their extremities
by soldering. These plates are held apart either by setting them into
paraffined wooden grooves at the ends of the trough or by interposing
between them pieces of paraffined wood.

[Illustration: FIG. 2.--BARRIER & TOURVIELLE'S ELECTRODOCK.]

In Messrs. Barrier and Tourville's _Electrodock_ (Fig. 2) the plates are
formed of concentric leaden tubes fixed into a wooden cover. These tubes
are threaded internally and externally, and the grooves thus produced are
filled with a peculiar cement composed of litharge, powdered charcoal, and
permanganate of potash, triturated together, sifted, and then mixed with
glucose or sugar sirup so as to make a paste of them. This mixture forms a
cement that is very adhesive after, as well as before, the electrolytic
action.