to photograph it. The plate was exposed ten minutes, but 
there was not the slightest trace of anything on it. 
The adjoining cut represents the apparatus employed, 
except that the receiver was replaced by the globe described 
above. The light round the ball gives a fair idea of the 
momentary appearance, and it is impossible to represent 
more, as this flickers and changes so rapidly. 
This corona when compared with the solar corona has the 
special features — 
1. The rifts and general radial appearance, including the 
bending and crossing of rays. 
