National Geographic : 1936 Jan
nlotograph byLapt. A.W. Stevens THE FIRST PHOTOGRAPH EVER MADE SHOWING LATERALLY THE CURVATUREOF THE EARTH This unusually interesting photograph of the Andes, including Mount Aconcagua (identified by a white line below the base), at adistance of287 miles, was made from an airplane, at an elevation of 21,000 feet, by Captain Stevens in the course of his camera survey of the Andean chain for the National Geographic Society in 1930. The mountain range, which shows clearly in the photograph, could not be seen by the photographer atthe time hemade this picture (see "Flying the 'Hump' of the Andes," by Captain Albert W. Stevens, in the NATIONAL GEOGRAPHIC MAGAZINE forMay, 1931). Captain Stevens used alens of 20-inch focus and an infra-red screen which admits to the sensitive photographic plate light that is invisible to the eye. The length ofthe exposure was 1/oth of a second. Almost exactly in the center of the range Mount Tupungato is distinguished. In the foreground isVilla Mercedes, Argentina.