Brinkley on Kefraclion. 

 TABLE II. 



367 



TABLE III. 



USE OF THE TABLES. 



Log. A. in minutes = Tab. I. + (A. C.) Tab. 11. + Tab. IIL 

 Log. B. in minutes = Tab. I. + Tab. II. + Log. bar. + 7.2773. 

 Log. Refr. in seconds = Tab. 11. + Log. bar. + log. tan. (zen. 

 dist.— A + B). 



