Photoelectric explorer for blind telephonists. (Machine-translation by Google Translate, not legally binding)

摘要

A photoelectric explorer for blind telephonists, which makes it possible to quickly locate a light source without using the organ of sight, constituted by a photoelectric device, which governs the existence or absence of an audible tone in a telephone receiver or other electroacoustic device, as well as the intensity and timbre of the note produced, by varying the distance between the photosensitive element and a light source. (Machine-translation by Google Translate, not legally binding)