Electrotyping. La Xatvre states that
some specimens o! metal work now on
exhibition in the halls of the Academy
are being greatly admired, and are mis
taken by every one for silver, until the
secretary explains that this effect has
been obtained by M. Gaiffe in deposit
ing a coating of cobalt on red copper by
means of a battery, It would seem as if
this new conquest of electroplating
might be applied to engraving; and to
show that it may be, the author sends
two proola, one taken from an ordinary
copper plate, and the other from the
same plate "cohalted." The advantage
of this process lies, first, in the durabil
ity of the cobalt, which allows of a
great number of impressions, and sec
ondly, in the fact that the plate being
exhausted, nothing is easier than to re
move the cobalt without harming the
copper, and then to cover it again with
a new coating. Nickel, which is so
readily applied to metals, will not admit
ot such a manipulation.
