Abstract :
At the 15th Annual Convention of the Illuminating Engineering Society held last September a paper “Determinations by Various Observers of Desired Road Illumination from the Automobile Headlamps”, by H. H. Magdsick and R. N. Falge, was presented. This paper covered the results of a systematic investigation of the lighting requirements under various conditions of road surface, contour, street lighting, boundaries, speed, weather, etc., for a large number of observers. Special equipment controllable by the observer in the moving car enables him to get just the distribution and intensity of light requisite for the given conditions. The fundamental data contained in this paper have proved of much interest and value to motor car, headlamp and cover glass manufacturers, state officials and others interested in motor car lighting. This investigation offers more definite criteria than were formerly available and provides reliable data against which to check the performance of given designs of equipment.
