REPORT OF THE SECRETARY 1h 
Mr. A. F. Moore, field director at Harqua Hala and Table Moun- 
tain, designed and superintended all the construction, the removal 
from Harqua Hala, and the installation at the new site. He, him- 
self, did no small share of the actual labor involved. Since October, 
1925, the observations have been going on regularly at Table Moun- 
tain. The high quality of the sky conditions has been found to 
amply justify the removal, and despite an unusually stormy spring 
in that part of the United States, the number of observing days 
- thus far has kept on a par with the average of five years at Harqua 
Hala. 
From the beginning of the work at the new station, the methods 
of observing and reduction have been put in the most complete accord 
with latest experience and with those employed at Montezuma. 
Furthermore, as it had been found that on very hazy days the bright- 
ness of the sky around the sun contributed an amount not negligible 
to the reading of the pyrheliometers, there were substituted on those 
instruments new vestibules of four times the former length. In this 
way the cone of sky, as seen from the sensitive part of the instru- 
ment, is cut down from a diameter of 10° to a diameter of 314°. Had 
this improvement been devised and made in 1920 a good many now 
worthless observations made at Harqua Hala might have been saved. 
Montezuma station.—When, in the year 1924, Mr. Roebling in- 
formed the Institution that he felt that his part in developing 
the solar radiation work should be ended with June 30, 1925, it was 
necessary to procure other support, or abandon the Chilean observa- 
tory. Accordingly, letters were prepared asking the National 
Academy of Sciences, the Chief of the United States Weather 
Bureau, and the director of the meteorological office of the Air 
Ministry of Great Britain whether in their judgment the public 
value of the observations warranted asking for sufficient increase of 
the governmental appropriation for the Astrophysical Observatory 
to carry on the Montezuma station. 
President Michelson of the National Academy of Sciences ap- 
pointed a committee consisting of Dr. W. W. Campbell, chairman, 
Dr. R. A. Millikan, and Dr. G. N. Lewis, to consider the matter. 
Their report, which was unanimously adopted by the Academy, 
follows: 
NATIONAL ACADEMY OF SCIENCES, 
Washington, D. C., April 30, 1924. 
Prof. A. A. MICHELSON, 
President National Academy of Sciences, 
Washington, D. C. 
Dear Siz: Your committee, charged with the duty of considering the proposed 
program of the Smithsonian Institution for measuring the heat radiations of 
the sun, begs to present the following report: 
