Calcutta, Madras, and Bombay , in the East Indies. 429 
The latitude was found by 32 meridianal observations of 
the sun and stars, north and south of the zenith, taken with 
the two sextants, and an artificial horizon. The height of 
the thermometer and that of the barometer was noted at the 
time of each observation, and the correction on this account 
was applied to the refraction. The declinations were also 
corrected for aberration, &c. and the results were : 
By 16 observations with Troughton's instru- 
ment .... iB°57 # 43 // ,5 
By 16 observations with Ramsden's . 18 ,57 43 ,8 
Mean latitude 18 57 44 N. 
The place of observation was 1' 37" north of the Church, 
and 3' 19"* north of the Light House. The latitude of the 
Church is therefore 18 0 56' 7", and of the Light House 
1 8° 54' 25" N. 
It may be useful to remark upon a difference with Rams- 
den’s sextant, in the results by the objects north, and by 
those south of the zenith in observing for the latitude ; and 
also the difference in the results by the lunar observations 
east and west of the moon. The instrument was most care- 
fully examined, and the error regularly found every day by 
measuring the sun's diameter ; yet, notwithstanding, the 
following differences were in the results : 
In the observations for the latitude, the object 
being North of the zenith . . i8 0 58'ii" 
South of the zenith . . . 18 57 16,6 
Difference -f* o 55 
* A survey was made for ascertaining this, as well as for the difference of longitude, 
f From this difference in the results for the latitude, a difference of more than 
half a degree might be looked for in those of the longitude, as we find to be the case. 
