1 62, Sir George Shuckburgh Evelyn's Endeavours 
Experiment the 2 d. June 1 6, 1797. 
The barometer being at 30,13 inches, and the thermom. at 68 c 
gi aius. 
Weight of the sphere, together with the scale, in air 29265,91 
Deduct the weight of the scale, or counterpoise, | 
m air 
Y 
544>°3 
>- 
Remains the total net weight of the sphere in air = 28721,88 
And, to reduce this to the same state of the"] 
atmosphere as the preceding observation, 
viz. 29,74 inches of the barometer, add the j 
correction for 0,39 inch (see table, §. 23. )J 
Also the correction for T of the thermometer 
And the net weight of the sphere, in an at mo A 
+ 
+ 
, 4 6 
,08 
sphere of 29,74 inches, and heat of 67°, becomes j” 
Weight of the sphere, with its scale, 
in water, 3,7 inches below the sur 
face, and the thermometer at ( 
66°, 1 - J 
28722,42 
>- 
grains. 
484,70 
485.09 
49,61 
49, 8i 
From thence deduct the weight oF^_ 
the scale in water - j 
The net weight of the scale in wa-j_ 
ter becomes - j 
To which, add the correction for the 
wires of the scale being immersed _ 
2,53 inches deeper now, than when >= 0,20 
its weight in water was determin- 
ed (see table, §. 23.) - j 
And the corrected net weight, in water, is 
Which, deducted from its weight in air, leaves ' 
the weight of a bulk of water = the sphere, 
in temperature 66°, 1 
Correction for o°,i of heat* 
And the true corrected weight of a bulk of wa- ' 
ter equal to the sphere, reduced to the baro- 
meter = 29,74, and therm. 66°, o, becomes 
* One degree difference of heat in the water will alter the weight of the sphere in 
water, or the weight of the bulk of water equal to it, = 4,54 grains ; so that, by far 
the greatest source of error, in these experiments, lies in the difficulty of exactly know- 
ing, and preserving, the temperature of the water. 
28672,61 
4 “ .45 
28673,06 
