Kamar yadda muka ambata a cikin labarin da ya gabata, Babban Westminster Clock wani bangare ne na Hasumiyar Westminster kuma mutane da yawa suna kuskuren bayyana shi a matsayin Big Ben, amma a cikin wannan labarin mun ambata cewa wannan sunan ya cancanci a same shi. ticks kowane awa daya wanda ya wuce.
Don haka, Babban Westminster Clock ya kunshi abubuwa daban-daban, wadanda suka hada da fuskokin gefen agogo, kararrawa, hasumiya, hannunka mai alamar sa'a da sauransu, kowane daya daga cikin wadannan abubuwan da ke da salon Gistic , wanda aka yi shi da tubalin da aka rufe shi da dutse, wannan a cikin cikakkiyar hanya a cikin bayanin.
Kowace fuskar agogo tana da tsayin mita 55, wannan agogon yana daya daga cikin mafi girma a duniya a lokacin da aka gina shi. Hannun da ke alamta sa'a yana auna mita 2.7, yayin da kuma yake nuna minti ya kai mita 4.3. Duk waɗannan abubuwa an shirya su a kan babbar hasumiya, wanda ke zaune a ƙasan mita 15 × 15, tare da wannan tushe dole ne ya ɗauki nauyin duka tan 8667.
Rashin daidaituwar filin ya sa an karkatar da hasumiyar zuwa arewa maso yamma ta hanyar milimita 220, abin da bai shafi ainihin maƙasudin wannan babban abin tunawa ba. Babban agogo na Westminster ya fara aiki a ranar 7 ga Satumba, 1859 har zuwa yau.