788 
CAPTAIN  A.  E.  CLAEKE  ON  THE  EEFECT  OE 
From  this,  taking  the  arcs  two  and  two,  we  obtain  the  following  results : — 
Arcs  compared. 
1st  and  2nd  .... 
1st  and  3rd  .... 
1st  and  4th 
1st  and  5th  .... 
2nd  and  3rd  .... 
2nd  and  4th  .... 
2nd  and  5th  .... 
3rd  and  4th  .... 
3rd  and  5th  .... 
4th  and  5th  .... 
Mean  value  . 
The  value  obtained  by  Ai’chdeacon  Peatt  is 
EUipticity  deduced. 
+ 0-01818 
-0-03363 
—0-01690 
-0-00577 
-0-11869 
—0-03516 
-0-01207 
+0-00364 
+0-00825 
+0-01148 
= -0-018067= -5+5- 
1 
~47-6846’ 
Taking  for  the  elements  of  the  mean  meridian  of  the  earth  the  values  adopted  by 
Archdeacon  Peatt,  viz. — 
«=20923713  feet  . . . . g=  ^ 
300-8’ 
we  obtain  for  the  different  arcs  the  following  values  of  A : — 
1st  arc,  value  of  A= -00986403 
2nd  arc,  value  of  A= -00986301 
3rd  arc,  value  of  A= -00986238 
4th  arc,  value  of  A= -00986104 
5th  arc,  value  of  A=-00985911 
If  we  take  the  differences  between  these  and  the  values  before  deduced,  we  have 
1st  arc,  defect  of  A below  the  mean= -00000995 
2nd  arc,  defect  of  A below  the  mean= -00001452 
3rd  arc,  excess  of  A above  the  mean= -00000837 
4th  arc,  excess  of  A above  the  mean=-00000824 
5th  arc,  excess  of  A above  the  mean= -00000351. 
These  quantities,  multiplied  by  the  lengths  of  the  several  arcs,  give  the  following : — 
II 
1st  arc : amplitude  is  in  defect  3-121 
2nd  arc:  amplitude  is  in  defect  1-928 
3rd  arc:  amplitude  is  in  excess  1-170 
4th  arc:  amplitude  is  in  excess  3-710 
5 th  arc : amplitude  is  in  excess  1-427 
which  are  considerably  smaller  than  the  values  obtained  by  Archdeacon  Peatt  from  the 
data  of  the  original  work. 
