Whatever the form of the record sheet, the speed recording stylus must normally move in a straight line and at right angles to the direction of travel of the record sheet.
Cibé foirme atá sa leathán taifid, caithfidh an stíleas taifeadta luais de ghnáth bogadh ar líne dhíreach agus go dronuilleach le treo taistil an leatháin taifid.