An Optical Altitude Indicator for Night Landing
A 1923 technical report photograph from the NASA Technical Reports Server, documenting an experimental optical altitude indicator for aircraft night landing; the record gives no maker or intended readership beyond aeronautical engineers. The photograph shows a boxed instrument with an open hinged cover, a graduated scale plate, and two brass-tipped rods mounted on flat bases, shot flat on a pale ground in sepia tones, offering a designer clean mechanical forms, measurement scales, and a utilitarian industrial look.
