4l6 ^ GEOMETRY. 



oncd from E, belong to the cosines of those sexagenary- 

 parts. 



9. To construct the Line of Lafiiudes^, 



A rule on A, and the several divisions of the sines on. 

 CD, will intersect the arc BD. in as many points ; on B, as. 

 a centre, transfer the intersections of the arc B D, to the 

 right line B D ; number the divisions from, B to D v^^ith- 

 10, 20, 30, &c. to 90 ; and BD will be a line o( latitudes, 



10. To construct the Line of Hcurs^ 



Bisect the quadrantal arcs B D, BE, in /r, h ; divide- the 

 quadrantal arc a b into 6 eq^ual parts, which gives 1 5 de- 

 grees for each hour ; and each of these into 4 others, 

 which win give the quarters. A rule on C, and the several 

 divisions of the arc ab^ will intersect the line MN in the 

 hour, &c. points, which are to. be marked as in the figure* 



II. To construct the Line of Inclination of Aferidiaiis, 



' Bisect the arc EA in c ; divide the quadrantal arc be in^ 

 to 90 equal parts ; lay a rule on C and the several divisions 

 of the arc be, and the intersections of the line HM wili 

 be the divisions of a line of inclinati-on of meridians* 



ssse^ses 



END OF FOZUME FIRST. 



