GREAT WALL OF PERU — SHIPPEE 473 



latest type. Our records are not in written words but in the photo- 

 graphs we have brought back. 



The Washington was in the air 351 liours, the L'hiia 103^^ hours; 

 40 hours were flown above 17,000 feet with the use of oxygen. The 

 highest altitude attained, just east of Lima, May 1, was 24,700 feet; 

 the temperature at this altitude was 4° F. (60° F. at 8,000 feet). 



Complete aerial surveys were made at Talara at an altitude of 

 15,000 feet; of Chan-Chan at 8,000 and 4,000 feet; of Pachacamac at 

 2,000 and 10,000 feet; of the Colca Valley at 21,000 feet; and of the 

 Andagua Valley at 20,000 feet. The oblique and vertical aerial pho- 

 tographs totaled 3,000; ground photographs, 1,000; motion pictures, 

 25,000 feet of standard 35 millimeters, 5,000 feet of 16 millimeters. 



