288 Captain Hall’s details of experiments 
Observations for the Latitude. 
October 16 , 1822 . By Stars. { 5 ZZLS&. 
a. Aquilae. 
Face of Instrument East. 
a Cygni. 
Face of Instrument West. 
Readings 1 ISt Vernier “ 3 * *8 2 5 
& | 2d Vernier - 19 10 
Readings f Vernier - 2° 2 27 5 
l 2d Vernier - 26 25 
Observed merid. zen. dist. 7 . , 0 
of a. Aquilae - - | 3 ^ 47^5 
Refraction - + 33,5 
Observed meridian altitude 7 , 
of « Cygni - - i 22 26 45 
Refraction - ~ 2 11,4 
ifc’s true merid. zenith dist. 31 19 21,0 
* ’s Declination - - 8 24. 35,9 N 
Latitude, face East - 22 54 45,1 S 
Latitude, face West - 22 56 3,7 
True altitude of a Cygni 22 24 33,6 
True meridian zenith dist. 67 35 26,4 
Declination of a Cygni - 44 39 22,7 N 
Latitude, face West - 2256 3,7 S 
Latitude of Gloria Hill, Rio 7 c 
Janeiro - - ^25524,48 
By the Sun. 
November 3 , 182 * 2 . 
Barometer 29,76. Thermometer 92 0 . 
Face of Instrument West. 
November 8, 1822 . 
Barometer 29,82. Thermometer 850. 
Face of Instrument East. 
. O / // 
D ,. \ 1st Vernier - 81 50 10 
Readings | 2j Vernier _ }} 
Readings f I st Vernier - 6 37 40 
S | 2d Vernier - 38 12 
99 45 
75 52 
O’s observed altitude, L. L. 81 49 52,5 
Q’s semi-diameter - + 16 9,9 
Apparent altitude O’s centre 82 6 2,4 
Refraction - — 7,4 
Parallax - + 1,6 
True altitude O’s centre - 82 5 56,6 
Observed meridian zenith 7 c 
distance O’s L. L. - j 6 37 5 <5 
O’s semi-diameter - — 16 11 
Apparent meridian zenith 7 g 
distance O’s centre J ^ 
Refraction - -J- 6,0 
Parallax - — 1,5 
O’s meridian zenith distance 7 54 3,4 
O’s Declination - - 15 1 55,8s 
South latitude, face West 22 55 59,2 
Mer. zen. dist. O’s centre true 6 21 49,5 
O’s Declination - - 16 32 50,4s 
South latitude, face East 22 54 39,9 
Ditto face West 22 55 59,2 
Latitude by the Sun - 22 55 19,5 S 
O/ll 
Latitude by Stars - 22 55 2 4>4 
Latitude by the Sun - 22 55 19,5 
Mean latitude of Gloria Hill, Rio de Janeiro 22 55 22 South. 
