Kubalwe umthamo ulwelo kwi itanki engaphelelanga
Khankanya milinganiselo lilitha
D - isikhongozeli sangqa
H - nqanaba lolwelo
L - isikhongozeli ubude
Inkqubo uzakubala umthamo ulwelo itanki Cylindrical, isixa esipheleleyo ezamahala amandla, indawo umphezulu.