A stylus device for use in a videographic apparatus, includes a housing with a projecting stylus. In operation, pressure changes cause movement of the resiliently mounted stylus. This carries a magnet which co-operates with a Hall Effect transducer such that the pressure variation is converted into signal changes by the transducer. A moveable carrier allows the transducer to be moved to adjust the preload pressure in the stylus together with the preload out-put of the transducer.
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* 5,530,207 Apparatus for making drawings on a sheet-like drawing carrier, for example a sheet of transparent paper, by means of a device for producing points, lines or the like, such as a pen or pencil or a pair of compasses
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