296 THE CHEMISTRY OF THE SUN. [CHAP. 



sealed at one end, and after inserting the metal to be experi- 

 mented on, drawing out the glass between the platinums to a 

 capillary^ tube. 



FIG. 99. 1st Form. Position of spectroscope when observing vapours close to 



the metal. 



I have also tried inserting the platinum pole at the end of 

 the retort, so that the spark passes from the surface of the metal, 

 but this arrangement did not answer at all. 



