National Geographic : 1937 Sep
0' LIKE A BATTERY OF WEIRD ARTILLERY, ECLIPSE INSTRUMENTS ARE AIMEDAT THE SUN Under the canopy, left foreground, the long box with the four black squares on its end is the first "polaroid camera" used successfully atasolar eclipse (pages 370, 371, 372). It was operated by Dr. F. K. Richtmyer, of Cornell University (right, under tower). On top of the tower is his "driving clock," which kept his instruments constantly pointed at the sun as the earth whirled on its way during the eclipse. The clock was run by a weight, shown hanging under thetower, improvised byDr.Richtmyer outof old iron from a wrecked ship on the island. In left background is the cannonlike camera of Dr. Irvine C. Gardner of the National Bureau ofStandards (page 375).