Proe. E.D.S., N.S., Vol. X. 



Plate IX. 



Pal 



Fic.n 



Fig. iii. 



Figs, i., ii. — Design illustrating the relative sizes of building and dome required for 

 the accommodation of fig. i., a 48-inch Equatorial mounted on nutation principle, 

 and fig. ii., a 48-inch Equatorial of the ordinary form of mounting. 



Fig. iii. — 18-inch Refracting Telescope, equatorially mounted. Lifting-floor worked 

 by hydraulic rani. Scale about 26' feet to one inch. Viewed from wesl 



