98 Mr. Ivory on the Theory of the Astronomical Refractions^ 
' Example L 
& = S6^ U’ 42” 
Therm. 8°*75 cent. = 47‘‘*75F. 
Barom. 0“*741 = 29T7 in. 
Example 2. 
d = 86“ 15' 20" 
Therm. 8|° cent. = 46°*9F. 
Barom. 0™-766 = 30-16 in. 
OD 
© 
2-86345 
86° 10' 
2-86345 
4 42” 
664 
5 20" 
753 
2-87009 
2-87098 
Therm 
•00214 
Therm 
•00276 
Barom 
9-98781 
Barom 
•00232 
Log B d 
2-86004 
Log § d 
2-87606 
724-5 
Id 
751-7 
-'25x -2i 
+ -5 
- -25 X -3-1 
+ -8 
•4 X -8 
- -3 
- -4 X - -16 
+ •6 
Corrected refraction 
12' 4"-7 
Corrected refraction 
12' 33"-l 
Observed refraction 
12 4 -2 
Observed refraction 
12 32 -5 
Example 3. 
Example 4. 
Mean of 42 sub-polar observations 
Mean of 10 observations of Ca- 
of a Lyras by Dr. Brinkley. 
pella, from a memoir of M. Plana. 
Irish Transactions, 1815. 
Acad, de Turin, tom. 32. 
^ = 87° 42' 10" 
d = 88“ 24' 9"-7 
Therm. 35“ 
Therm. 47°*75 
Barom. 29’5 
Barom. 29*75 
87“ 40' 
3-00522 
88° 20' 
3-08087 
2 10" 
392 
4 9^'-4 
847 
3-00914 
3-08934 
Therm 
•01444 
Therm 
•00214 
Barom. ...... 
9-99270 
Barom 
9-99607 
Log B 3 
3-01628 
Log B d 
308755 
Id 
1038"-2 
Id 
1223"-3 
- -6 X -15 
+ 9-0 
- -95 X - 24 
+ 2-1 
- M3 X i 
-0-6 
— 1-6 X -27 
-0-4 
Corrected refraction 
17' 26"-6 
Corrected refraction 
20' 25" 
Observed refraction 
17 26 -5 
Observed refraction 
20 24 -3 
We may now inquire how far the refractions are likely to 
be affected by the term which it was found necessary to leave 
out, because the present state of our knowledge of the phse- 
nomena of the atmosphere made it impossible to determine 
the coefficient f by which it is multiplied. For this purpose 
the term alluded to, viz. 
sin e X /' X X Qa> 
