The position of a pen or stylus with respect to a piece of paper is converted into two DC signals in a pair of potentiometers which are mechanically linked to the pen support mechanism. The DC signals are then converted into AC signals which are recorded on magnetic tape. When the tape is played back, the AC signals are reconverted into DC voltages which drive a negative feedback servomechanism system and thereby reproduce a signature previously recorded on the magnetic tape.
In teaching certain subjects, it is necessary to communicate with the students using drawings as well as voice. Well known devices such as film, video tape and television have been used to automate the teaching process. Such devices, however, are expensive and difficult to use, especially by the teacher. This invention provides a system and devices used to implement the system, which enable automation of the teaching process, and which are relatively inexpensive and easy to use by both the teacher and student. Specifically, the invention pertains to an automated teaching system where a lecture consisting of voice and drawings or sketches and figures can be recorded on magnetic tape by means of an x-y record-reproduce device. The lecture, once recorded, may be duplicated many times and distributed among many students who can reproduce the recorded lecture on similar devices. The graphic information is reproduced on standard ordinary sheets of paper which the students may keep for later reference.
