Sun's observed and computed right ascensions , &c. 463 
Table VIII. 
To show the Transits of the Pole Star, and the nature of the 
exposure to which the Instrument was subjected. 
1821. 
Observed Transits of the Pole Star. 
m. s. 
m. s. 
h. m. s. 
m. s. 
m. s. 
A 
B 
C 
D 
E 
October 20 
28 40.0 
43 i-5 
0 57 20.0 
11 39-5 
26 1.5 
Polaris. 
E 
D 
c 
B 
A 
21 
28 38.0 
O 
6 
12 57 I9.O 
11 35.0 
25 55-° 
Polaris sp. (trem*.) 
E 
D 
c 
B 
A 
22 
28 34.0 
42 58.5 
12 57 I7.5 
” 35-5 
25 55.0 
Polaris sp. 
A 
B 
c 
D 
E 
22 
28 42.0 
43 3-o 
0 57 20.5 
11 38.0 
26 2.0 
Polaris. 
E 
D 
C 
B 
A 
24 
28 34.5 
42 55.0 
12 57 14.0 
11 29.5 
Polaris sp. 
On the 2 1 st and 22nd, the Sun’s rays were allowed to fall upon the instrument, 
immediately after the star, at its sub polar transit, had passed the wire C, until its 
transits over the wires B and A, were procured. 
With these exceptions, the instrument was entirely defended, from the influence 
of the solar rays. 
Exposure of the Instrument, October 21. 
Times of Comparison. Thermometers under the cover Thermometers under the cover 
„)_ of the Black, or Western Axis. of the White, or Eastern Axis. 
12 56 5o°.o 5o°.o 
»3 9 59 0 5 1 -5 
>3 10 60 .5 51 .5 
13 12 62 .0 51 .7 
13 19 65 .0 52 .0 
13 2 3 67 .0 52 .2 
13 26.30 69 .0 52 .5 
Mean — 63 .7 Mean = 51 .9 
Hence, difference of temperature — n°.8. 
Thermometers placed under the covers of the black and white braces, did not differ 
with those applied to the axes, half a degree. 
During the observations not a cloud visible. 
