Scientific Intelligence. 265 
(Zo be continued.) 
=—__ 
SCIENTIFIC INTELLIGENCE, 
I, .CHEMISTRY AND PHYSICS. 
Metals, 
as the alloy, while one-tenth part of copper renders aluminum as 
rittle as glass, An alloy of 5 parts of silver with 100 of aluminum 
Works like silver but is harder and takes finer polish. The one-thousandth 
of bismuth renders aluminum so brittle that it eracks under the hammer 
“ren after being repeatedly annealed. The presence of aluminum in 
25 4 
ae Pag ot : 
| ; t num beautifu 
color and hardness enough to scratch the standard alloy of gold employed 
tal oY 9f 95 parts of iron with 5 of aluminum does not differ essen- 
of 2.2 Properties from iron, An alloy of 90 parts of copper with 10 
Slurninum may be forged by the aid of heat and is not acted on by 
SECOND SERIES, VOL. XxIiI, NO. 68,—MARCH, 1867. 
34 
