V A R 



Sin. 36orr 

 Sin. 450^: 

 Sin. 54o= 

 Sin. 60 = 



Sin. 720 - 1 ^10 -f 2 V~5- 

 Sin. Sio = I 



Sin. 900 - i. 

 TWILIGHT. See Refraction. 



U, V. 



VARIATION and dip of the Magnetic Needle. 



TABLE I. 



Shewing the variation of the Needle in various parts of the earth, from 

 Professor Hansteen, of Christiania. 



331 



