Sun's observed and computed right ascensions , &c. 461 
Table VII. — continued. 
Exposure of the Instrument, June 2. 
Times of Comparison, 
h. m. 
3 3 ° 
Thermometers under the cover 
of the Black, or Western Axis. 
6 7° 5 
Thermometers under the cover 
of the White, or Eastern Axis. 
6 7° 8 
o 
5 
15 
28 
34 
4 4 2 
80 .0 70 .0 
7 1 .0 
73-o 
86 .0 
95 -° 
. 96 .0 
98 .0 
100 .5 
74 -o 
74 -5 
75 -° 
Mean — 92 .6 Mean — 72 .9 
Hence, difference of temperature — i9°.7. 
Thermometers under the covers of the braces, afforded results similar with the 
above. Not a cloud passed over the Sun, during the time the instrument was ex- 
posed to his rays. Thermometers placed immediately over the black axis, never 
indicated a temperature exceeding 94°. 
Exposure of the Instrument, June 4. 
Times of Comparison, 
h. m. 
3 5° 
Thermometers under the cover 
of the Black, or Western Axis. 
68°. 5 
4 25 96 .O 
4 35 9 8 
4 40 100 .0 
4 45 *04 -° 
4 50 107 .0 
Thermometers under the cover 
of the White, or Eastern Axis. 
68°. 3 
71 .0 
72 .0 
74 .0 
76 .0 
76 .0 
Mean = ioi .o Mean = 73 .8 
Hence, difference of temperature — 2j°.2. 
Thermometers placed under the covers of the braces, do not differ one degree from 
the above. A cloudless sky. 
3 0 
MDCCCXXVI. 
