ASTRONOMICAL LABOURS OF JAYASINHA. 191 



this gnomon are two concentric femicircles, having for 

 their diameters the two edges of the gnomon ; they 

 have a certain inclination to the horizon : at the fouth 

 point, I found it to be twenty-nine degrees (nearly 

 equal to the latitude,) but at fome diitance from that 

 point it was thirty-three degrees. Hence it is evident, 

 that they repreient meridians, removed by a certain 

 angle upon the meridian of the place. On each fide 

 of this part is another gnomon, equal in fize to the 

 former ; and to the eafhvard and weft ward of them, 

 are the arches on which the hours are marked. The ufe 

 of the centre part above defcribed, I have never been 

 able to learn. The length of the gnomon, which is equal 

 to the diameter of the outer circle, is thirty-five feet 

 four inches. The length of a decree on the outer 

 circle is 3.74 inches. The diitance between the 

 outer and inner circle is two feet nine inches. Each 

 degree is divided into ten parts, and each of theie is 

 fubdivided into fix parts or minutes. 



3. The north wall of this building connects the 

 three gnomons at their higheft end, and on this wall 

 is defcribed a graduated femicircle, for taking the al 

 titudes of bodies, that lie due eail or due weft from 

 the eye of the obferver. 



4. To the weilward of this building, and clofc to it, 

 is a wall, in the plane of the meridian, on which is 

 defcribed a double quadrant, having for centres the 

 two upper corners of the wall, for obferving the alti- 

 tudes of bodies palling the meridian, either to the 

 north or fouth of the Zenith. One degree on thefe 

 quadrants meafured 2.833 inches, and thefe are di- 

 vided into minutes. 



5. To the fouthward of the great dial are two build- 

 ings, named 



M 4 Uftuanah* 



