* 6 &0 J / 
r 
3 
/o ascertain a Standard of Weight and Measure . 355 
scale in which it hung ; these therefore were removed, and the 
experiment repeated, as follows : 
Weights 
as before 
No. 12 : 
No. 9 
grains. 
2048 
: 256 
200 
< 
The buoyancy of 
the air bubbles 
being removed 
Add the corrections 
for the loss of ! 
weight in the | 
wires, as beforej 
And the more exact 
weight of the cylin- 
der in water becomes 
= +{ 
30 
10 
4 
1,10 
3 
1,07 
+ 
2353A7 
0,05 
= 2553,22 
Note, when 
the cube 
the cylinder 
with the temperature bo 0 , 5 
inches. 
and the barometer 29,47 
was weighed in water, its " lnches * 
centre was below the 
surface of the water 
2,5 
3>7 
that is, the cylinder was the deepest by - - — 1,2 
The repetition of this experiment shews how necessary it is 
to attend to the most trifling circumstances : there were not 
more than three or four of these particles of air, and those not 
larger than a small pin’s head. Moreover, it may be noted, 
the distilled water in which these experiments were made, 
being afterwards examined with my (Martin’s) hydrometer, 
in the heat of 60°^, weighed on that scale — 1,0005 5 so that 
I see no reason for diffidence in the quality of the water. 
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