Mapaipi esimbi akatwasukainoda kushandisa chigadzirwa kuti chienderane mukugadzira kugadzirwa, ndiko kuti, girazi remafuta, iro rakagadzirwa negirafu risati rashandisa girazi remafuta, nekuti panguva iyoyo pakanga pasina chigadzirwa chakadaro pamusika.Nokudaro, graphite inogona kushandiswa chete semafuta, asi pasi pekushandiswa kwenguva refu, munhu wose achawana mamwe matambudziko, kureva, kupisa kwekushisa kwe graphite kwakakwirira kwazvo, uye kupisa kwekushisa kwekushisa kunewo kwakashata zvikuru.Nenzira iyi, tembiricha ye mold ichakurumidza kukurumidza panguva yebasa, uye zviri nyore kukonzera kupfeka chiitiko cheyakatwasuka seam simbi pombi, kuitira kuti chigadzirwa hachigone kushandiswa kwenguva yakareba.Naizvozvo, vagadziri vanga vachitsvaga chigadzirwa chinogona kutsiva graphite, kureva, mafuta egirazi, asi nei achifanira kushandiswa?Izvi zvinodaro nekuti kune zvakawanda zvakanakira trolley furnaces.Kutanga, kupisa kwekushisa kunenge kwakaderera, kuitira kuti iite basa rekuchengetedza kupisa uye inogonawo kuwedzera nguva yekushandiswa kwemidziyo.