: on mixing Gold with Tin. 465 
BE xP Eon DM BE Noe. TY. 
‘One hundred and forty grains, or half an ounce, of the 
like grained tin, were mixed, as before, with twelve ounces 
of fine gold; and the bar refulting from this mixture was 
completely found and good; evidently paler and harder, how- 
ever, than any of the foregoing, and cracking rather more 
than the laft on pafling between the rollers; but bearing every 
other operation, even {tamping under the prefs, by the common _ 
force, without any apparent injury. 
EXPERIMENT ¥. 
One ounce of tin was next ftirred into twelve ounces of the 
like refined gold, and then caft as before; but the bar pro- 
duced, though feemimgly folid and good, was bad coloured, 
brittle in texture, and, on the firft pafling between the rollers, 
fplit into feveral pieces, fo that no. farther trials were made 
with it. 
EXP eR REM EN OVE. 
To inquire how far the fumes of tin, brought into: contact 
with the gold, would do more than mixing the metal in fub- 
ftance, a {mall crucible, filled with twelve ounces of ftandard 
gold, 4! fine, was placed in a larger crucible, having one 
ounce of melted tin in it, and kept there in fufion, the whole 
being covered by another large inverted crucible, for about 
half an hour. In this time a full quarter part of the tin was. 
calcined ; but the gold remained unaltered, and equally capable 
of being manufactured as another portion of the fame gold. 
melted in the common manner. 
