ARTIFICIAL SUNSPOTS. 



Fio. 1. — Wooden Ball, showing Rotating Spots. 



FlO. 3. — An Ordinary Spot. 



EAST, 



Fig. 2. — Wooden Ball, showing Spot on the I^iiiib. 



FlQ. 7.— Part of a Photograph of the Sun, taken 1893, August, 9d. lOli, 10m. 2.")S. Ctreenwich Mean Time, at the Royal Observatory, Greenwich, 



with the Thompson Photoheliograph of nine inches aperture. (Negatiye image.) 



FlQ. 4.— An Active Spot. 



Fig. 5. — A Spot after an TJpheayal. 



Fig. 6.— A Djing Spot. 



