Show earth pictured round photographs taken during a stratosphere flight of the national geographic society army air corps balloon explorer II 11 at an altitudes altitude of feet above the earths surface showing the lateral curva i 1 ture of the earth includes a stretch of the horizon miles in length lengthy 1 this represents more than three degrees of a circle nearly one of the total circumference of the earth the curve of the horizon was easily noticeable when the picture was projected on a screen yn I 1 the edge of a ruler is laid sy the horizon line the curva curvature Ss IS even more plainly visible I 1 |