On the Liquation of certain Alloys of Gold. 



33 



in gold, and with the clear indication thus afforded I proceeded to 



make the following experiments : 

 The alloy- 

 Zinc 11-0 



Silver 7-5 



Gold 81-5 



100-0 



and weighing 5'680 kilograms, was now alloyed by the addition of 

 lead to produce a similar metal to P. 13 (see p. 25), say : 



Zinc . . 

 Lead. . 

 Silver 

 Gold.. 



10 



20 



7 



63 



100 



and this was cast into two spheres, a 2-in. sphere and a 3-in. 

 sphere. 



This alloy was so hard and brittle that I was compelled to cut 

 these spheres into two by sawing them. When so cut asunder it was 

 evident that the upper portions of both these spheres had a marked 

 white appearance, as compared with the lower portions, which 

 possessed the yellow colour of gold. The 3-in. sphere weighed 

 3'484 kilograms. Portions removed from these two spheres at the 

 points indicated showed the following results : 



FIG. 10. 



And those from the 2-in. sphere, weighing 0'880 kilogram 



VOL. LX. 



