decoder manual rack particularly as an aid in teaching

摘要

decoder manual rack.characterized by the fact of consist in a frame (1) including a plurality of parallel axes (2) forming a rack and in which in each said axis (2) are put on at least two tubes(3)4) movibili at least rotativamente independently and carrying each of them in the respective portion visible externally from one side or the other of the rack of the parameters of informationion so that by rotating the one or the other in combination with the other tubes of the adjacentit can form in the respective portions are visible externally of the series of internal pipes (3) a sequence of information and the number of external pipes (4), a corresponding sequence of informationequivalent ions (fig. 1).