Revolving Beacon Light Type DCE14 from "Fliers Of The Night," 1929

A 1929 illustration in "Fliers of the Night," a Crouse-Hinds Company Aviation Lighting Catalog, depicting an aircraft flying through the evening sky, with revolving beacons which are mounted on towers, as well as red course lights right under the beacons, which are used to indicate the direction of the next beacon. This also shows an image of a Type DCE14 red course light image at the bottom right.
Revolving Beacon Light Type DCE14 from "Fliers Of The Night," 1929