NAVIGATION CHART, &C. 



a 1.7 



USE OF THE PRECEDING TABLES. 



EXAMPLE I. 



Required the Course and Distance between Cape Clear in 

 Ireland, in latitude 51° 18' N. and Island of St. Mary's one of 

 the Azores, in latitude 37° N. difference of latitude 14° 18'= 

 858 miles, and their difference of longitude being 15° 10', or 

 910'. (See Robertson's Navig. prob. III. p. 156.) 



i ... Middle Latitude 44° 9' ' 



Correction to lat. 37° and diff. of latits. 14° 18' about 26 from Table I. 



A3 difference of latitude 



Mean Parallel 44° 35' 

 858' log'. 2.933487 



log. A 2933487 



