National Geographic : 1937 Sep
374 THE NATIONAL GEOGRAPHIC MAGAZINE NO MOVIE STARS EVER REHEARSED MORE HOURS FOR THEIR 3% BIG MINUTES! Helping Dr. Gardner insert photographic plates in the 14-foot aluminum camera is Richard H. Stewart, National Geographic Society staff photographer (left). The camera is set up on its globe trotting packing case, where warnings in English, German, and Russian recall its part in the National Geographic Society-National Bureau of Standards Eclipse Expedition of 1936, led by Dr. Gardner. BURNING MIDNIGHT LANTERN OIL TO STUDY THE MORNING SUN Dr. Theodore Dunham, Jr. (left), and Charles G. Thompson, who assisted him during the eclipse, take nocturnal notes while checking their two coelostats. These machines have mirrors turned by a mechanical device so that they point continuously at the sun and focus an image of it into the spectro graph. Thus they need not keep the big spectrograph itself pointed at the sun.