Translation from the Astronomical Jour. of Hamburgh, 227 
the usual vertical screw is notin the arrangement; instead of 
this, the piece bearing the Ys, is formed like an arch, the mid- 
e of which is supported by a screw, the higher or lower 
position of which, elevates or depresses it by the different 
degree of tension of the metal which is produced by the 
action of the screw and its own elasticity. This method 
in the centre, but by a zone of a sphere of eight 
ameter, to which the two parts of the telescope tube are 
screwed ; this arrangement is made with a view to greater 
bases are three inches, and ends one and a half inches in di- 
ameter. Upon these arms the two feet horizontal circle is 
made fast; three of these cones are longer; these contain 
manner 
* The transit of the ob tory at Greenwich is adjusted i thi , and 
as it is ten feet in length, the doubt whether the plan be applicable to large in- 
struments is settled by actual experience. 
