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44,1,68 
150 Sir George Shuckburgh Evelyn’s Endeavours 
And we have the whole weight of the scale for the 1 g ai £, 3 » 
, . f— 856,15 
cube in water ------ J 
But the weight in air having already been found - = 968,40 
The difference of the weights - - - =112,25 
Gives for the specific gravity of this brass - = 8,63 
(§. 19.) The counterpoise to the scale for the cylin- 
der, in the same water, with the same heat - 
To this, add the weight of the common scale, as before = 413,40 
And the whole weight of the scale for the cylinder, 1 
>= &%JZ,Qo 
in water, becomes J 
Its weight in air has already been found - - = 965,7 4 
The difference of these weights - = 110,66 
Gives for the specific gravity of this brass - == 8,78 
The mean specific gravity of this brass and brass- 1 
wire may therefore be put at about - J 
N. B. The tables of specific gravity give that of wrought 
brass from 8,00 to 8,20. It was necessary to ascertain the 
specific gravity of the brass wire, to make the correction men- 
tioned in the note to §. 10.; for, as it was highly probable, that 
in experiments with this hydrostatic balance, the scales for the 
cube and cylinder would occasionally be immersed to different 
depths in the water, and their weights would be altered, as 
more or less of the wires by which they were suspended re- 
mained out of the water ; 
I accordingly found, that 80 inches in length of thisl grainj 
wire, used in the scales for the cube and cylinder, >=6,16 
weighed in air - - - J 
And consequently, 1 inch would be = 0,077 grain, and four 
wires of 1 inch = ,308 grain ; which, divided by the specific 
gravity, viz. fj, would give 0,0354 grain, for the correction of 
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