Essay on the Figure of the Earth. 51 
since it shows that each geodetic survey, and particularly the 
og sari require correction. The writer shows 
two examples how we must proceed and what we may 
ex pect 
ween "oma and Dorpat the difference of longitude was 
fata as follo 
seechomietd 3° 36’ 16-77 
Geodetic 8 86 23 07’ 
Difference +694 = 57-9 toises. 
The correction now found to the geodetic is— 
—6"01 = 50°1 toises. 
and the remaining error = 093 = 78 toises. 
Between Pulkowa and Warsaw is found— 
Astronomical 9° - 48/43 
Geodetic 9 Ol “24 
Differenc +12’"-81 = 124°7 toises. 
Correction to gid geodetic —18 ‘85 = 183°4 toises. 
remaining error = — 6 -04= 58°7 toises. 
The first error is thus 2, got rid of and the second is 
reduced to nearly one 
The writer concludes with the following remarks: 
“This determination of the earth’s figure is only an approxi- 
mation, subject to many imp rovements, when we have more 
data, and when we use more rigorous methods of reduction. But 
it shows that we can obtain an agreement of the measures in 
which we have not heretofore succeeded. The determination of 
the general neue of the earth does not exclude local irregulari- 
ties of its surfac 
When this fy potiibars of the earth’s fi el after a scrutinizing 
investigation, = A pte adoption, al hieal positions 
_ determined b ¢ means,must h th Ciperecbivicn applie : 
: iar es fake penal to the differences of longitude.” 
tha a portance of the sais requires the 21 eget bee Bien 
e suffici - 
warded tA further reliable data, articularly from the western 
pe computer. It may be re- 
astern Siberia, For these countries we have at present not 
even approximate determinations. ‘The Pennsylvania measure 
of 1764 is worthless for accurate investigation and the superior 
eruvian measure is at too great a distance. Measurements of 
