to ascertain a Standard of Weight and Measure. 139 
f 4 5 
The above four mean dimensions may be called equa- 1 42,6 
toriai, viz. 43,9 
U 5 > 6 ' 
The mean of which is 
Div. of micr. 
Div. of micr. 
Div. of m 
diam. 
therm. 
diam. 
"42 
45 
therm. 
diam. 
40 
44 
EF < 
44 
^62°, 5 
1,2. ^ 
45 
> 6V,6 
eo 
►F 
4 1 > 
4 5 
. 45 , 
40 
. 4 E 
40 
_ 4 E 
Mean 
00 
»\ 
42,6 
4 Ei 
44?3 
therm. 
'62°, 8 
1 
These three last dimensions, together with the 1st TA B = 45 
of the preceding set, may be called meridional, ^ E F — 44,8 
being in a circle at right angles to the former, 1 1,2 = 42,6 
viz. ------ [3,4 = 41,1 
The mean of which is ----- = 43,4 
and differs from the former not quite — - inch. 
In another great circle, 90° from the preceding, comprising 
the diameters already taken, E F and C D, at the intersection 
of the two former circles, were taken 
The diameter 
a (3 
Div. of micr. 
4 1 
44 
« 44 >, 
4 1 
_ 4 ° 
The diameters 
5 taken as beforeT ^ ’^ 
c D J 14 3>9 
a (3 - - 42,5 
7 $ “ ~ - 41,0 
therm. 
diameter 
y $ 
Div. of micr. 
40" 
41 
< 42 >, 
40 
42 
therm. 
Mean 
= 43,0, which is that of another great circle 
