In this case, the rotating movement of the record sheet must be continuous and uniform, with a minimum speed of seven millimetres per hour measured at the inner border of the ring marking the edge of the speed recording area.
Sa chás sin, caithfidh an mheicníocht rothlach den leathán taifid bheith leanúnach agus aonfhoirmeach, agus íosluas seacht milliméadar in aghaidh na huaire a thomhaistear ag an gcuibheas istigh den fháinne lena marcáiltear imeall an limistéir don luas a thaifeadadh.