70 Mr, Hatchett's Experiments on the various Alloys , 
Experiment iv. 
Eighteen pennyweights and ten grains of the fine gold, were 
first alloyed with one pennyweight and ten grains of copper, and 
afterwards with four grains of lead. This, in colour, resembled 
the former ; it was also as brittle, but the grain was coarser, 
and shewed some metallic lustre. 
Experiment v. 
In Experiments 11. hi. and iv. one ounce of standard gold 
had been prepared, but two ounces were now employed ; so that 
the lead should be in the proportion of one grain to each ounce. 
To one ounce sixteen pennyweights and twenty grains of 
fine gold, when in fusion, three pennyweights and two grains of 
copper were added, and afterwards two grains of lead. 
This ingot resembled the former, and was exceedingly brittle. 
Experiment vi. 
The ingot formed by the preceding experiment was melted 
again, with one ounce sixteen pennyweights and twenty grains 
of fine gold, alloyed with three pennyweights and four grains of 
copper, so that the lead was in the proportion of ^ a grain in 
each ounce 
The colour was as before ; and the metal was very brittle, 
and of a very loose spongy texture. The latter circumstance 
explains why the specific gravity amounted only to 16,627. 
Experiment vn. 
One ounce of the metal formed by Exper. vi. was melted 
with eighteen pennyweights of fine gold, and one pennyweight 
