58 Mr. Hatchett’s Expewnents on the various Alloys, 
very brittle, and, like the former bar, exhibited a coarse grain 
in the fracture. 
Experiment iii. 
Eighteen pennyweights and ten grains of the line gold, were 
alloyed with one pennyweight and six grains of copper, and, 
when in fusion, eight grains of zinc were added. 
This experiment was conducted as quickly as possible ; but 
nevertheless, upon weighing the ingot, it appeared that the whole 
of the zinc had been volatilized ; and this was farther proved, by 
the colour, and by the perfect ductility of the metal. 
Experiment iv. 
To eleven ounces one pennyweight and three grains of the 
fine gold, in fusion, eighteen pennyweights and twenty-one 
grains of fine brass wire were added, and mixed as before. 
The external and internal colour was of a fine pale yellow ; 
but the metal was very brittle, and the grain of the fracture was 
coarse. 
Experiment v. 
To eighteen pennyweights and ten grains of gold, alloyed 
with 19 grains of copper, in fusion, were added 19 grains of fine 
brass. 
This ingot did not, in general properties, differ from the former. 
The following experiment was made, to ascertain the effects 
of zinc upon gold, when the two metals were melted in open 
vessels, near each other, without being in absolute contact. 
Experiment vi. 
One ounce of fine gold was melted in a four-inch crucible* 
which had been previously placed within another, of 12 inches. 
