Methods or arrangements for graph-reading or for converting the pattern of mechanical parameters, e.g. force or presence, into electrical signal (feelers for copying devices on machine tools B23Q35/00; arrangements for measuring areas G01B; measuring force G01L; adapted as input devices to computers G06F3/00; combined with pattern recognition G06F18/00; arrangements for image or video recognition or understanding G06V10/00; character recognition, recognising digital ink or document-oriented image-based pattern recognition G06V30/00; systems for transmitting the position of an object with respect to a predetermined reference system, e.g. tele-autographic system, G08C21/00)