114 HROWX : 



and of the arches where the graduation was were of white 

 marble, little of which remains. 



Another equatorial dial, smaller and of different construc- 

 tion stands at a little distance in a very perfect state. The 

 gnomon which stands in the middle contains a staircase lead- 

 ing up to its top and on either side of the gnomon are concen- 

 tric semi-circles having a certain inclination to the horizon. 

 They represent meridians removed by a certain angle from the 

 meridian of the place. On each side of this part is another 

 gnomon of equal size to that last mentioned. The north wall 

 of this structure connects the three gnomons at their highest 

 end and on this wall is described a graduated semi-circle for 

 taking the altitudes of bodies that lie due east or west from 

 the observer. A double quadrant is described on a wall to the 

 westward of the building. South of the great dial are two 

 buildings apparently exactly resembling each other, and 

 adapted for the same purpose, the observation of the altitude 

 and azimuth of the heavenly bodies. They are circular, with 

 a pillar in the centre of each rising to the top which is open. 

 From this pillar at the height of about three feet branch hori- 

 zontal radii of stone to the circular wall. The radii are thirty 

 in number, the spaces between them are equal to the radii, 

 which increase in breadth as they recede from the pillar. In 

 the wall at the spaces between the radii are recesses with holes 

 to enable a person to climb to the top and containing each of 

 them two windows. On the edges of the recesses are marked 

 the degrees of the sun's altitude as shown by the shadow of 

 the pillar. The degrees are again subdivided into minutes. 

 The spaces in the wall are divided into six equal parts or 

 degrees by lines drawn from the top to the bottom. By obser- 

 ving on which of these the shadow of the pillar falls the sun's 

 azimuth is determined. The altitude and azimuth of the 

 moon and oi a star may also be found by means of this 

 erection. 



The dimensions of the building are thus given by Mr. 

 Hunter : — Circumference of the building 172 ft. ^ in. : of the 



