Isicelo:
Imishini yokuqala yokuqhumisa amashothi emhlabeni yazalwa eminyakeni eyi-100 eyedlule. Isetshenziswa kakhulu ukususa ukungcola kanye nesikhumba se-oxide ezindaweni ezahlukahlukene zensimbi noma ezingezona ezensimbi nokwandisa ubulukhuni. Ngemva kweminyaka eyikhulu yentuthuko, ubuchwepheshe bokuqhumisa amashothi kanye nemishini sekuvuthiwe impela, futhi ububanzi bokusetshenziswa kwayo buye banda kancane kancane kusukela embonini yokuqala esindayo kuya embonini elula.
Ngenxa yamandla amakhulu okuqhuma ngokudubula, kulula ukubangela ukwehla kokuthamba kwendawo noma ezinye izinkinga kweminye imikhiqizo edinga kuphela umphumela omncane wokwelashwa. Isibonelo, ama-brake pad esithuthuthu adinga ukuhlanzwa ngemva kokugaya, kanti umshini wokuqhuma ngokudubula ungabangela kalula umonakalo ebusweni bezinto ezingqubuzanayo. Ngakho-ke, umshini wokuqhuma ngesihlabathi usube ukukhetha okuhle kwemishini yokuhlanza indawo.
Isimiso esiyinhloko semishini yokuqhuma isihlabathi ukusebenzisa umoya ocindezelwe ukufafaza isihlabathi noma isibhamu esincane sensimbi esinosayizi othile wezinhlayiya ebusweni obugqwalile bento yokusebenza ngesibhamu sokuqhuma isihlabathi, esingagcini nje ngokufeza ukususwa kokugqwala okusheshayo, kodwa futhi silungiselela indawo yokupenda, ukufutha, ukufaka i-electroplating nezinye izinqubo.