specific Gravity , and comparative Wear ofi Gold. 6 1 
GOLD ALLOYED WITH NICKEL. 
Experiment i. 
Eighteen pennyweights and ten grains of the fine gold, were 
alloyed with one pennyweight and fourteen grains of pure me- 
tallic nickel, and the whole was then poured into a cupel. 
This button was of the colour of fine brass ; it immediately 
broke under the hammer, with a coarse-grained earthy fracture. 
Experiment n. 
Eighteen pennyweights and ten grains of fine gold, being 
alloyed with 19 grains of copper, were afterwards melted, and 
mixed with 19 grains of pure nickel. The external colour of 
this metal resembled gold made standard by conper, but was 
paler in a slight degree. It was brittle, and shewed a fine-grained 
fracture, of an earthy appearance. 
Experiment in. 
Eighteen pennyweights of the fine gold, alloyed with one 
pennyweight and six grains of copper, being melted, eight 
grains of nickel were added, and mixed as before. The colour 
of the ingot was like that of the former experiment, and the 
metal proved to be only slightly brittle. 
Experiment iv. 
To eighteen pennyweights and ten grains of fine gold, alloyed 
with one pennyweight and ten grains of copper, when in fusion, 
were added four grains of nickel. The colour of this button was 
like that of gold made standard by copper, and, under the ham- 
mer and rollers, it was found to be perfectly ductile. 
