frovi the principal Measurements of Arcs of Meridians, 'ill 



Hence we obtain 



u = -\- 0-01937669 Weight = 1768 

 3/ = + 0-01782113 = 7869 



and the errors of the single latitudes are then as follows : 



Peruvian Measurement. 



Tarqui - 3 4 30-83 +1*79 



Cotchesqui + 2 37-88 —1-79 



First East Indian Measurement. 



Trwandeporum +11 44 52-59 —0-59 



Paiidree 13 19 49*02 +0-55 



Second East Itidian Measurement. 



Punnac 8 9 38*39 —1*73 



PutchapoUian 10 59 48-93 —1-21 



Dodagoontah 12 59 59-91 +3-50 



Nantkabad 15 6 0-64 —0-57 



French Measurement. 



Formentera 38 39 56-11 +3*39 



Montjouy 41 21 45*45 +2*56 



Barcelona 41 22 47-16 +0-83 



Perpignan 42 41 58-01 —4-15 



Carcassoue 43 12 54-31 — TOl 



Evaux 46 10 42-19 —5-88 



Pantheon 48 50 48-94 +0-36 



Dunkerque 51 2 8-74 +3*88 



English Measurement. 



Dunnose +50 37 7-81 — 1*88 



Greenwich 51 28 39-60 +0-95 



Blenheim 51 50 27-50 +3-01 



Arbury Hill 52 13 27-79 +1-83 



Clifton 53 27 31*59 —3*89 



Hanoverian Measureme7it. 



Gottingen 51 31 47*85 —2*74 



Altona 53 32 45*27 +2*74 



Swedish Measurement. 



Mallorn Q5 31 31*06 +1*33 



Pahtawara 67 8 51*41 —1*33 



The sum of the squares of these errors is 157"-78 ; and lience 

 results the mean error of a determination =3"- 140. The 

 mean errors arc : of n = 0-07468 !• 



of y = 0-035401 



Substitiitiu" 



