160 Sir George Shuokburgh Evelyn's Endeavours 
or meridian, at right angles to the former; from whence it will 
be seen, that not one of the three circles differs from another more 
than about inch. 
10,000 
The preceding 9 mean dimensions of the diameter, collected, 
are 
A B 
CD = 4 3,9 
G H = 42 ,6 
IK = 45,6 
E F — 44,8 > 
1,2 = 42,6 
3,4 =41,1 
« £ = 42,5 
=41,0. 
the mean of which is 
in the temperature 
- 62°, 6 
Now the import of the foregoing experiments is this, that 
when the mean diameter of the sphere is holden between the 
points of contact of the gauge, near 0 an dp, the index of the mi- 
crometer shews = 43,7 divis* 
but, when the bar r is placed there, it shews = 64,5 
the difference is = 20,8 
and by so much is the bar shorter than the diameter of the 
S P here ' inches. 
These divisions, 20,8, are equal to (§. 26.) - 0,00202 
and the length of thebar has already (§. 25.) beenfound=6,oo543 
therefore the true diameter of the sphere becomes =6,00745 
which quantity I think must be true to within inch. 
(§. 28.) The cube of this diameter, 6,00745 inches x ,5236, 
as is well known, will give the contents of the sphere in cubic 
3 2 /ranches, viz. = 113,5194 inches, which must be very near the 
truth : for, if not, let it be supposed that the inaccuracy in the 
measurement, or the irregularities in the figure of this sphere, 
