Aluminium and Sodium. 259 
M. Dumas also remarked on the fact that the study af element had 
introduced a new process into the arts for the reduction of ores—that 
from the chlorid of the metal; and that this method nade be important 
for other metals not yet brought into use. He also mentions the sono- 
ronze, having a quality of tone not hitherto observed in any metal in 
the pure state, which is another peculiarity of this curious metal. 
He stated, in reply to oe sale that the materials employed in 
making 1 kil, of aluminium—viz., the ammoniacal alum, the alumina 
which is pitigee from it, ahiorine, carbon, carbonate of eh chalk, 
are all of low price. The whole cost is reduced to 32 francs, whieh 
is very small, end we consider that the expense of sodium, when 
experiments in aluminium were begun, was 1000 francs per siege 
which alone would make the price of alumi cs, M 
Balard, who is familiar with industrial applications, stated that he had 
gone through with the steps of the proce: el, and was sips 
pared on a large 
The chlorid of aluminium is prepared at the Javel works by the re- 
e 
cined—which is easily effected in a gas retort. T tion of 
the chlorid is produced ina r of masonry, lined with earthen 
are. The chlorid contains a crs iron, seus: is removed entirely 
in treating it for yreveatis: b ing its to pass over points 
oy 
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vapor of the chlorid of 7 dopaaaae on leaving the apparatus, ee 
colorless transparent cr 
0 preparing the i there are used— 
maha carbonate of soda, - : er parts. 
Dry coal of Charlero roy, 450 
which are pulverised, mixed with care, roe eiaesd to a red heat in 
& pot 
Wheatst stone long since showed that aluminium was as strongly nt 
tive as platinu M. Hulot, director of the galvanizing wot 
zine, the latter amalgamated some considerable time previously, when 
charged with water acidulated with a twentieth of sulphuric acid at 
6 
fi 
that from a couple of platinum and zine, excited to t 
After six hours, the current had lost a fifth of its original force. he 
ery was not completely polarised at the ®: ou the 
Current still preserved . t auarie of its first force. To restore its oo 
ro-negative character to the aluminium, it was necessary only to 
Merse it an instant in ake acid and then it. 
According to the Messieurs Tissiers, pure aluminium is easily distin- 
guished from the impure, by its greater whiteness, its indistinct traces 
of ery stallization, and rarely one or two well defined hexagons on the 
