the cube, cylinder , &c. used by the late Sir G. S. Evelyn. 325 
By the 1st trial the diameter of the sphere ex- Divisions. 
ceeded the length of the rule - 12,83 
By the 2nd - 12,30 
By the 3rd - 12,82 
Mean 12,65 
which converted into inches, gives 0,0012281 for the excess 
of the diameter of the sphere above the length of the rule. 
Length of the brass rule. 
The brass rule was laid upon the standard scale, where it 
remained for two days before the measurement was made, 
in order that it might acquire the same temperature. The 
rectangular pieces of brass were then applied to its extremi- 
ties, and the distance between the dots compared with the 
distance from 26 to 32 inches upon the scale, in the manner 
which has been before described. 
Readings of the Micro- 
meter at the 
Difference, 
deducting 
304 divisions. 
* 
Scale. 
Dots 
25 
396 
67 
24 
393,5 
65,5 
23 
39 
64,7 
21 
39 1 
66 
20,5 
389,5 
65 
21 
388,4 
6 3>4 
' 
Mean 
%>3 
=,0063609 of an inch. 
* The distance between the Dots. Seepage 318. 
