 Nyorai kupfuurira kweiyi ndima - Muna 1834, mwero wekutanga weImperial yard wakaparadzwa zvishoma mumoto unozivikanwa seKupisa kweParamende.. Muna 1838, dare rakaumbwa kuti rigadzirezve zviyero zvakanga zvaparadzwa, kusanganisira Troy pound, iyo yakanga yaparadzwawo. Muna 1845, chiyero chitsva chedare chakavakwa zvichibva pamatanho maviri akange aripo anozivikanwa seA1 neA2, ese ari maviri akaitirwa Ordnance Survey, uye R.S. 46, yadhi yeRoyal Astronomical Society. Dzose dziri nhatu dzakanga dzaenzaniswa nomwero woUmambo moto usati waitika. 