Vol,. 6, 1920 
ASTRONOMY: C. G. ABBOT 
95 
compute and send out the result of morning observations of a given day 
before night-fall. A brief empirical method for the determination of solar 
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radiation has lately been devised at Calama and seems satisfactory, so 
that it is possible that the result of a morning of observation may be tele- 
graphed to the world by noon. 
1 This is issued as the second of a series of research surveys prepared under the auspices 
of the National Research Council. Reprinted in Reprint and Circular Series of the 
National Research Council, Number 7. 
2 Smithsonian Misc. Coll. Washington, 68, No. 3, 1917. 
3 Now in course of publication by the Smithsonian Institution. 
