National Geographic : 1918 Jan
A .. N AVIATOR'S SIGN-POST FOR NIGHT FLYING "Signal equipment consists'of four- or six-light projectors with red or green lenses. They are mounted on angle-iron frames four feet square, standing three feet high. Each unit has an automatic flasher system attached. For indicating the direct flying route from Dayton to Rantoul, lights flash on and off at about six-second intervals." AN AVIATOR'S LANDING FIELD INDICATED BY HUGE NUMERALS PAINTED ON THE ROOF OF A BARN The initial program for a well-marked air route from Dayton, Ohio, to Rantoul, Ill., designed as an aid to the training of aviators, includes the painting of large white figures on barn roofs, with arrows pointing in the direction in which the birdmen can find safe landing places.