sulgemishälve
mahuti täistraaversil erinevate seisuasendite vahel horisontaalsete nurkade mõõtmisel saadud mõõdiste summa ja sama traaversi teoreetiliste nurkade summa erinevus, difference between the sum of the horizontal angles measured between the various stations of a complete traverse of the tank and the sum of the theoretical angles for the same traverse
