GRAPHIC ANSWER INPUT DEVICE FOR A TEACHING MACHINE

摘要

A graphic answer input device for a teaching machine of a sandwich structure comprising four elements placed one above another, namely a board with contacts electrically connected to the logical unit of the machine, a perforated card with holes, a current-carrying plate and a problem blank for the student to plot the required drawing on, the heads of the contacts being rectilinear polyhedrons in shape, which makes it possible to have the number of holes in the perforated card equal to that of contacts on the contact-bearing board and, hence, to increase the resolution of the input device as a whole.