[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 Planté 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.
[Illustration: FIG. 3.--KORNBLUH'S ACCUMULATOR.]
In Kornbluh's accumulators the plates consist of ribbed leaden gratings
between which is compressed red lead prepared in a peculiar manner, and
constituting, 48 hours after formation, a compact mass with the lead. The
tangs of the plates are widened so as to touch one another while leaving a
proper distance between the plates themselves, and are hollowed out for
the reception of a rod provided at its extremities with a winged nut and
jam nut for passing them up close to one another. The plates, properly so
called, are held apart by rubber bauds. The glass vessels are placed in
osier baskets.--_La Lumiere Electrique._
* * * * *