Light Beacons for Night Flying: The Relative Merits of Reflecting and Refracting Apparatus for Aerial Beacons Available to Purchase

IN view of the preference in America for the modified searchlight type and in Europe for beacons using dioptric systems, it is of interest to consider the advantages of each type. It will be assumed that the most desirable form of vortical distribution curve of the light is known and as a concrete example, the form given in Fig. 1 has been taken. Now this curve may represent a vertical section through the beam from—