498 NEW INSTRUMENT FOB, SPECIFIC GRAVITIES. 



finding specific gravities, except in its not requiring 

 the use of weights ; and the advantage it possesses 

 over the former scale is, that it will give the spe- 

 cific gravity of platinum with as much accuracy as 

 that of the lightest mineral. 



Canaan Lodge, ) 

 \Uh Dec. 1820. I 



