12 



NA TURE 



\Muy 5, 1 88 



of some fifteen acres in extent, about 200 feet over the I a magnificent edifice has been erected, which measures 

 general level of the city, and nearly three miles to the from north to south 330 feet, and from east to west 240 

 north of the cathedral of St. Stephen's. On this plateau | feet. The general plan of the observatorj- is that of a 



Fig. j.— Eye-End and Breech-Piece cf Telescope. A is ihe micrometer eye-pitce : d b, h,^ndIes Tor working the focus.'ing: screw ; c, eye.piece of finder 

 (^«^ telescope, 4 in. aperture ; d, eye-piece of reader for reading right ascension and declination circles ; e, handle for revoK ing same to point to various 



verniers: F, clamping handle in declination ; g, slow motion handle in declination ; H, clamping cords for right ascension ; 1, slow motion cord for 



right ascension ; K, quick mction handle for right ascension and declination movements; l, flute key for position circle clamping; m, window 

 ; through which glass position circle is viewed while illuminated from behind by beam cf light frcm gas-lamp at end of declination axis ; N, screw 



for slow motion in position angle ; o, key for throwing into position a set of illuminators for " datk field " illumination of micrometer ; p, handle 



for throwing into positicn an arm carrying one central mirror for "bright field" illumination cf 1 ' 



Latin cross. One great dome forms the centre, three 

 smaller domes terminate the extremities of three of the 

 short arms, while the fourth arm, looking south, contains 



the libraiy and lecture-rooms, &c. The south _/irf(7rtV is 

 very inrposing, and in it are the rooms for the director of 

 the Observatory. In one of the smaller domes (each 27 



