OF DIALING. 351 



With any opening of the compasses, as Z L, (plate 5, LKCT. 

 fig. 4.) desribe the two semicircles L Fk and L Q k, upon \^V-v^ 

 the centers Z and z, where the six o'clock line crosses the 

 double meridian line, and divide each semicircle into 12 

 equal parts, beginning at L (though, strictly speaking, 

 only the quadrants from L to the six o'clock line need be 

 divided :) then connect the divisions which are equidis- Horizontal 

 tant from L, by the parallel lines K M, IN, HO.GP, dinl 

 aud-FQ. Draw VZ for the hypothenuse of the stile, 

 making the angle V Z E equal to the latitude of your 

 place ; and continue the line V Z to R. Draw the line 

 jR r parallel to the six o'clock line, and set off the dis- 

 tance a K from Z to Y, the distance b I from Z to X, 

 c H from Z to W, d G from Z to T, and e F from Z to 

 S. Then draw the lines Ss, Tt,Ww, Xx, and Yy, 

 each parallel to R r. Set cff the distance y Y from a to 

 11, and fromy to 1 ; the distance x X from b to 10, and 

 from g to 2 ; w W from c to 9, and from h to 3 ; t TYrom 

 d to 8, and from i to 4 ; s 5 from e to 7, and from to 5. 

 Then laying' a ruler to the center Z, draw the forenoon 

 hour-lines through the points 11, 10, 9, 8, 7 ; and laying 

 it to the center *, draw the afternoon lines through the 

 points 1,2,3,4,5; continuing the forenoon lines of 

 VII and VIII through the center Z, to the opposite side 

 of the dial, for the like afternoon hours ; and the after- 

 noon lines IIII and V through the center z, to the oppo- 

 site side, for the like morning hours. Set the hours 

 to these lines as in the figure, and then erect the 

 stile or gnomon, and the horizontal dial will be 

 finished. 



To construct a south dial, draw the line V Z, making s h 

 an angle with the meridian Z L equal to the co-latitude dial. 

 of your place ; and proceed in all respects as in the 

 above horizontal dial for the same latitude, reversing " 

 the hours as in Fig. 2, and making the elevation of the 

 gnomon equal to the co-latitude. 



