180 



Mr. Ivory on Atmospheric Refraction. 



App. Alt. 



Therm. 

 Fahr. 



Barom. 



Obs. Refr. 



New Table. 



Brinkley. 



2° 35' 



31" 



-13° 



30-26 



18' 



1" 



19' 



1" 



19' 18" 



2 54 



56 



— 24 



30-65 



18 



20 



18 



25 



18 41 



3 7 



34 



—24 



30-65 



17 



26 



17 



34 



17 47 



3 16 



35 



-13 



30-26 



15 



33 



16 



16 



16 24 



3 19 



16 



-39 



29-73 



16 



12 



17 



3 



17 16 



3 20 



46 



— 24 



30-65 



17 



16 



16 



44 



16 55 



3 21 



9 



— 23 



29-82 



15 



41 



16 



15 



16 22 



3 41 



1 



— 39 



29-73 



15 



27 



15 



46 



15 52 



3 49 



44 



-45 



29-32 



15 



2 



15 



25 



15 30 



4 



19 



—45 



29-32 



14 



56 



14 



52 



14 57 



4 7 



20 



-39 



29-73 



13 



58 



14 



29 



14 34 



4 9 



8 



-45 



29-32 



14 



43 



14 



28 



14 32 



4 10 



56 



-13 



30-26. 



13 



24 



13 



32 



13 35 



4 IS 



36 



-39 



29-73 



13 



38 



13 



58 



14 2 



4 19 



42 



— 45 



29-32 



14 



13 



13 



59 



14 2 



4 21 



21 



-41 



29-76 



13 



52 



13 



56 



14 1 



4 21 



59 



-37 



29-82 



13 



34 



13 



48 



13 51 



4 22 



23 



-23 



29-82 



12 



55 



13 



15 



13 17 



4 22 



50 



-13 



30-26 



12 



48 



13 



4 



13 6 



4 22 



54 



-39 



29-73 



13 



47 



13 



47 



13 48 



4 22 



55 



-21 



29-84 



13 



1 



13 



9 



13 12 



4 23 



5 



-23 



29-50 



13 



9 



13 



5 



13 7 



4 23 



8 



— 20 



29-67 



13 



00 



13 



3 



13 5 



4 23 



9 



-27 



29-95 



13 



16 



13 



25 



13 28 



4 23 



31 



— 43 



30-20 



14 



10 



14 



8 



14 12 



4 36 



23 



— 29 



29-81 



13 



9 



12 



54 



12 57 



4 39 



31 



— 31 



29-74 



13 



5 



12 



50 



12 52 



7 35 



18 



-27 



29-80 



8 



36 



8 



18 



8 17 



7 37 



8 



— 32 



29-78 



8 



35 



8 



23 



8 21 



The inspection of this table shows that the New Table deviates 

 less from observation than Dr. Brinkley's table in twenty-two 

 instances out of twenty-nine ; it is more distant from the truth 

 in six instances ; and in the remaining instance neither table has 

 the superiority over the other. It cannot therefore be consi- 

 dered as a thing proved, although it has been said, that for 

 altitudes less than 10°, and at very low altitudes, Dr. Brink- 

 ley's table is nearer to the truth than the New Table. 



Sept. 12, 1828. J. Ivory. 



XXVI. On 



