316 



KNOWLEDGE. 



August, 1913. 



Figure 3-14. 

 A greatly disturbed Sun. 



The Astronomer- Royal has kindly permitted us to reproduce the photograph of the Sun taken on August 8th, 1893, only a 

 short time before the maximum activity. The great spot group is over 100,000 miles at its greatest diameter, and the 

 longer group on the other side of the equator nearly 130,000 miles in length. This picture presents a striking contrast 



to Figure 343. 



