Technical Chemistry. 125 
appears, however, to be less generally known among chemis 
That the metal could readily be worked in this manner was repeat- 
several years an established branch of industry in this country, 
ts. 
Plat 
erican Cyclopedia, New York, 1861: 
ible 
the metal is too cool to be welded, and hammering upon it will have the 
effect of shattering the piece. The metal should be handled with tongs 
Plated with platinum, and hammered first with a clean hammer, weigh- 
ing Rot more than a pound, upon a elean anvil; and both hammer and 
anvil should be as hot as possible without drawing the temper of the . 
hich metal cools very quickly, and it is with difficulty kept at the 
gh heat required. After being welded a heavier hammer may be used 
for forging. Dr. Roberts, having condensed the scraps or sponge by 
F 20 ounces weight, places two of these blocks in the mufile together ; 
soon as they attain the high temperature required he removes 
wne speedily to the anvil, and it 3 or four quick sharp blows in 
£2832 
Xd forgin are crystalli nd sonorous, and break easily like spelter.” 
The following sda! hecacks descriptive of the blowpipe used, and 
ane of employing it, are quoted from the article Blowpipe in the 
Volume of the N. A. Cyclopedia, p. 385. 
=a 
* This Journal - 
tina subseq 4 no’ his. 328) Hare mentions an experiment 
in Which } rnal, XXXxV, men ; 
< : melted 25 vais aa tinum to a state so liquid that the contain- 
2 8 Mass of 23 ounces, “I re 
@ the power of my app 
