Manufacture of Aluminium. ” . 2 
soldering pon discovered. The inventor is a gilder and silverer of metals, 
belonging to Paris, named Mourey; he has recently announced his pro- 
I. 3 Ke Iv. v. 
Zine, 80 85 88 . 
Aluminium, 20 15 
To prepare it, he melts the aluminium in a crucible of eee the 
meta a having been reduced to fragments and added little by little; when 
the mass is in fusion it is stirred with an iron rod while the zine is added 
in aint quantities at a time; the alloy is still stirred while a little tallow 
is added to prevent the oxydation of the zinc, and then it is cast in small in- 
It is important to avoid too high a temperature lest the zine should 
he volatilized. It is also important that the zine should be free from iron. 
These five alloys have different points of fusion. Alloy No. 1 is the 
hardest, the others are softer in regular succession 
s for the manipulation of the solder, this comes under technology : 
r. Mourey has described it in riggs: but it would be going too much 
resins, 
This flux is used for thoroughly impregnating the fragments of solder 
shah are to be employed. It is important to use the blowpipe no longer 
than is necessary, to prevent loss of zinc from volatilization. 
tly, another novelty of this branch of manufacture is aluminium 
bronze, en has the e proportion of ten ah rts of aluminium to ninety of 
copper, has the tenacity of steel. This alloy is now applied ona 
large sale, by J. M. Christoffle ; he has noticed that it is of great advan 
to make all the surfaces of friction in machinery of aluminium-bronze. _ 
Thus a bearing which had been placed on a polishing lathe making 2200 
revolutions a minute was found to last eighteen m months, while bearings 
of other different metal, had, in the same circumstances, lasted at most 
only three months, He has “employed this bronze with equal success in 
the manufacture of cannon, howitzers, and all kinds of weapons of war. 
| Pistol-barrels have been this made pees have done good service. 
There is as yet nothing very conclusive with regard to this application 
to artillery ; ; but Mr. Christofile, relying on the tenacity of aluminium- 
resistance to . ras it mai ¢ applicable to 
E the phere; of bronze for cannons. As in France large artillery- 
pieces are constructed exclusively i in “the government workshops he has 
_ asked for a permit to manufacture at his own oosaggas me pieces of ar- 
 tillery, especially ce as ave most exposed to i 
