86 Mr. Hatchett’s Experiments on the various Alloys , 
Experiment x. 
One pound Troy of standard gold was made as already 
mentioned, and another Swedish copper dollar was employed 
for the alloy. 
The metal was cast in a mould of iron, and proved to be 
ductile; it is therefore very evident that the Swedish copper 
dollars are not of an uniform quality. 
Experiment xi. 
Eleven ounces one pennyweight and three grains of the fine 
gold, were alloyed with eighteen pennyweights and twenty-one 
grains of fine British granulated copper. 
When this was cast in a mould of iron, it was found to be 
slightly brittle. 
Experiment xii. 
When the same bar was cast in sand, the brittle quality was 
much increased. 
Experiment xm. 
Eleven ounces one pennyweight and three grains of fine gold, 
were alloyed with eighteen pennyweights and twenty-one grains 
of British granulated copper which was considered as better 
than the former. 
The bar was cast in the mould of iron, and was very ductile. 
Experiment xiv. 
The same bar being melted, was cast in sand, and then was 
found to be brittle. 
Experiment xv. 
The abovementioned brittle bar was again melted, and was 
cast in the mould of iron. 
