NO. 



SMITHSONIAN EXPLORATIONS, I92O 



17 



level. The instruments are arranged in a tunnel excavated hori- 

 zontally in solid rock near the summit of the mountain. Observers' 

 quarters, computing rooms, garage and shop are located some three 

 hundred feet lower in a sheltered ravine. These quarters can be 

 reached by the auto truck in 50 minutes drive from Calama. No road 

 had to be constructed, as there are no trees in the region, and a way 

 was found smooth enough, and of sufficiently easy grade, without 

 working. Within about two months of receipt of the Institution's 

 telegram, Mr. Moore completed these arrangements, removed the 



Fig. 2^. — Observatory on Mt. Harqua Hala. 



outfit from its former location and recommenced observing August 

 5, 1920, at Montezuma with the loss of but ten days for the removal. 

 He regards the new site as excellent, and expresses doubt if a better 

 one could be found in the whole world. 



In December, Mr. Moore returned to the United States, turning 

 over the Directorship of the Chile Station to Mr. Leonard H. Abbot, 

 formerly assistant, who is now assisted by Mr. Paul Greeley. Tele- 

 grams giving the values of solar radiation observed are sent as 

 heretofore to Buenos Aires and forwarded from there to Rio de 



