50 
ARCHDEACON PRATT ON THE EFFECT OF LOCAI 
Calculation of the Values of A for an ellipse, in which a =209237 1 3 
and 2 
1 
~300-8 
(see art. 6). 
^=i(l + E.s)=— ^/1 +e). 
arc a ojsinr'Ve / 
=log 
'7*3206389' 
6*6855749 
2*4782778 
[4*4844916 
300*8 + E= 
300*98569 
300*95446 
300*93545 
300*89455 
300*83571. 
=log-i 
5*5155084 + 2*4785458' 
5007 
4733 
4144 
3293. 
=log- 
'3*9940542' 
3*9940091 
3*9939817 
3*9939228 
.3*9938377. 
= 0*00986402 
0*00986300 
0*00986238 
0*00986104 
0*00985911 
Differences between these and 
the former values of A. 
— 0*00000929 
-0*00001450 
+ 0*00000946 
+ 0*00001220 
+ 0*00000676 
Calculation of the Errors in amplitude (see art. 6). 
Multiply these last differences by the lengths of the arcs. 
1st arc, amplitude is in defect log“> 
6*9680157' 
5*4965090 
0*4645247. 
2nd arc, amplitude is in defect log"’ r5*l6l3680 
5*1232046 
10*2845726, 
=2"*914 
: 1"*926 
3rd arc, amplitude is in excess log"’ 
4th arc, amplitude is in excess log"* 
5th arc, amplitude is in excess log-’ 
5*9758911 
5*1455755 
.0*1214666. 
'5*0863598' 
5*6532559 
.0*7396158 
6*8299467 
5*6090210 
0^9677 J 
= 1"*323 
= 5"*491 
= 2"*748 
