Other

Price/stern/sloan Publishers, Inc.

Price Stern Sloan Inc.

Stephen O Frazer

Martin Philip Riddiford

Seamus A Sharkey

Jonathan James Knight

Electronic test sensor unit

Electronic sensor pen

Teaching and amusement apparatus

Draughting tables, drawing boards, drawing instruments and analogous

Teaching or amusement apparatus consists of a substrate bearing printed intelligence and a detector pen or unit for use therewith. The detector pen discriminates between areas on the printed substrate by means not visible to the naked eye e.g. by a difference in magnetic properties, infrared reflective properties or capacitative properties of different parts of the printing. Depending on the type of printing and the degree of complexity of detection, a wide variety of games and teaching aids may be produced using this basic approach. A typical example is a quiz game where a question may be followed by five printed answers, only one of which is correct, that correct one being printed in a detectably different way from the others.

Teaching or amusement apparatus

Growing community of inventors

London, United Kingdom

Stephen O Frazer