338 



central tube, to about 1680° C. The platinum-crucible is borne upon a 

 movable support of l)urned magnesite. which can be fixed to the 

 iron support A at any elevation. 



Tiie construction and arrangement of the part A* of the adjusting 

 device is elucidated more in detail in fig. 'Sa and 3b, a giving the 



Fig. 3. 



external view from one side, /> a section through it, in a plane, 

 perpendicular to that of fig. 'M. 



The apparatus consists of two metal discs Pi and 1\, of which 

 the disc P^ with the tube S attached to it, can be moved horizont- 

 ally round the hemi-spherical button Q, and by means of the screws 

 A^ and A, can be brought to any inclined position with respect to 



