Electro-metallurgy. 265 
statues and other ornaments in iron or brass with a thin layer of copper. 
One of his last works was the galvanic coppering of the monumental 
fountains in the Place de la Concorde. Three months sufficed him for 
Covering 190,000 kilograms of iron with a layer of copper two millime- 
in thickness, weighing nearly 16,000 kilograms. Persons who know 
that iron rapidly oxydizes in the presence of a layer of copper which 
covers it galvanoplastically would not anticipate very great durability for 
these works of art. ey will have a different opinion when they know. 
that the layer of galvanoplastic copper is nowhere in contact with the 
hucieus of iron, and that the two metallic surfaces are completely isolated 
from each other by a kind of varnish or glazing, which is applied with a 
brush and which dries very rapidly by reason of the i j 
contains. The real novelty of the process consists in the applicatiou of 
Ment of 5700 bladders 
When the layer of varnish is well applied there is no danger of ~ 
©xydation of the iron. It is thought that a greater difficulty may arise 
ron the unequal expansion of the two metals. The cient of dila- 
tion of cast iron is 000111, while the coefficient for copper is 0-00171. 
assume completely the appearance of objects in bronze. Even statues 
ter ppe i 
we OD ingled with his glazing colors having @ 
udry has recently ming’ g > ete ig * 
gs, and he has learned that this substitution may be made wi ; 
Valtage, Painting with the glazing, which at Paris they call metallic 
Painting because it contains a small quantity of porphyrized copper, dries 
