LOCAL  ATTEACTION  IN  THE  ENGLISH  AEC. 
789 
The  diagram  at  page  35  of  the  paper  referred  to,  will,  by  the  substitution  of  the  quan- 
tities just  obtained,  be  changed  to  the  following : 
From  the  ‘ Account  of  the  Principal  Triangulation,’  page  712,  it  appears,  however, 
that  the  most  probable  deflections  are — 
At  Dunnose  . 
At  Greenwich 
At  Arbury  . . 
At  Chfton  . . 
At  Burleigh  Moor 
1-117  South. 
1- 864  North. 
2- 226  North. 
2- 447  South. 
3- 689  South. 
These  values  result  from  the  comparison  of  all  the  geodetical  and  astronomical  deter- 
minations in  Great  Britain  and  Ireland,  When  the  English  arc  is  used  in  the  deter- 
mination of  the  flgure  of  the  earth,  in  combination  with  the  measurements  in  other 
coun tries,  the  following  system  of  quantities  is  obtained  (pages  764,  765): — 
At  Dunnose  . . . . 1-767  South. 
At  Greenwich  . . . 1-270  North. 
At  Arbm-y  . . . . 1-692  North. 
At  Clifton  ....  2-864  South. 
At  Burleigh  Moor  . . 3-885  South. 
From  this  it  will  be  seen  that  the  “ rough  approximation  ” of  Archdeacon  Peatt  (at 
page  46  of  his  paper),  namely,  the  determination  of  the  local  attraction  at  Burleigh 
Moor  from  the  form  of  the  masses  of  hill  in  the  neighbourhood,  is  exceedingly  near  the 
truth.  He  finds  3"-660  South,  which  is  intermediate  to  the  quantities  quoted  above, 
viz.  3" -5 8 9 and  3"-885 ; but  the  values  assigned  at  page  47  for  the  deflections  at  the 
other  stations  are  not  correctly  inferred. 
