1S SOUTHERN CALIFORNIA ACGADEMY OF SCIENGES 
Photograph of the Sun 
The view presented herewith is an excellent reproduction of 
a photographic image taken with the spectrohelograph of the 
Snow telescope at the Solar Observatory on Mount Wilson by 
Photograph of the bright calcium floceuli of the sun, reduced from a 
photograph 13.3 inches in diameter, taken with the spectroheliograph 
of the Snow telescope at the Solar Observatory on Mount Wilson, 
under the direction of Dr. George E. Hale. 
Dr. George EK. Hale, on July 26, 1906, at 5:26 p.m. It was 
taken with the hght of the caleium line H2, and shows the 
bright clouds of calcium vapor, or calcium floceull. It is a 
notably fine specimen of an exceedingly ingenious device in- 
vented by Dr. Hale for securing photographie images of any 
