National Geographic : 1926 Jan
MEASURING THE SUN'S HEAT 125 A TEMPORARY OBSERVATION STATION AT BASSOUR, ALGERIA This station was located in the Algerian desert, at an altitude of about 5,000 feet. The tube on the left is a spectrobolometer, which measures the intensity of all the wave lengths in the spectrum. The man on the right is reading a pyrheliometer, an instrument used to measure the total radiation being received. Photographs from Dr. C. G . Abbot MONTEZUMA SOLAR-RADIATION OBSERVATION STATION NEAR CALAMA, CHILE This is an almost ideal location for observing solar radiation. It is situated on the western slope of the Andes, in the .Desert of Atacama, at an elevation of about o1,ooo feet. This is one of the most desolate of the world's desert places, where not even the hardiest cactus will grow. All the water used by the observers at this station has to be hauled 12 miles.