[ r 53 ] 
formerly given an account of ; none falling confider- 
ably fhort of the mean gravity, and fome rather ex- 
ceeding it. 
• 
Gravity. 
Platina 
By 
Experiment. 
1 7.OOO 
By 
Calculation. 
Difference; 
Platina 1 Gold 1 
l8. I4O 
18.I42 
O. 02 
Platina 1 Gold 3 
18.613 
18.7I4 
0. IOI 
Platina 1 Gold 5 
l8.8l2 
I 8.9O4 
O.O92 
Platina 1 Gold 1 1 
18.835 
I9.C94 
0.279 \ 
Platina 1 Gold 15 
1 8.918 
19.142 
O.224 | 
Platina 1 Gold 23 
ip. 089 
I9.189 
0.100 
Platina 1 Gold 31 
1 9.128 
l 9 ' 2 1 3 
0.0857 
Platina 1 Gold 47 
19.262 
19.237 
0.025- *> 
Platina 1 Gold 0 c 
Gold 
I 9- 2 73 
19.285 
19.261 
0.0123 
G 
O 
w 
G- 
G 
s 
Q 
£ 
CTJ 
I 
Experiment III. 
As a mixture of platina with an equal quantity of 
gold has been reported to be fpecifically heavier than 
gold itfelf, but turned out otherwife in the above 
experiments - } fome further trials were made on that 
head 
i. Inftead of the crude mineral, whole gravity is 
but 1 7, we took platina, that had been cupelled with 
lead, one of the neateft of the buttons formerly men- 
tioned, which, tho’ retaining a portion of the lead, 
was nearly as ponderous as fine gold, viz. 19.240. 
This was melted with equal its weight of the gold, 
in a ftrong fire, and continued in fufion for about an. 
hour : the mafs proved fpongy, and very light. We 
Vol 5,0. X remeked 
