Tirohia te wāhanga i raro nei, kātahi ka whakautu i te pātai i muri mai i te reo kotahi me te wāhanga:  Putanga: E rongonui ana te nekehanga o te karaka mō tōna pono. Ko nga kaihoahoa ko te roia me te kaitoi amateur ko Edmund Beckett Denison, me George Airy, te Astronomer Royal. I whakawhirinaki te hanganga ki te kaihanga karaka a Edward John Dent; i muri i tona matenga i te tau 1853 ka oti i tana tama a Frederick Dent te mahi, i te tau 1854. I te mea kaore i oti te pourewa tae noa ki te 1859, ka whai waahi a Denison ki te whakamatautau: kaua ki te whakamahi i te rerenga mate me te whakahou i hangaia i te timatanga, i hangaia e Denison te rerenga taumaha takirua takitoru. Ka whakaratohia e tenei rerenga te wehenga pai i waenga i te pendulum me te miihini karaka. Kua whakauruhia te pendulum ki roto i te pouaka hau-aukati i raro i te ruma karaka. Ko te 13 waewae (4.0 mita) roa, taimaha 660 pauna (300 kg), whakairihia i runga i te rārangi o te maitai puna 1⁄64 inihi i roto i te matotoru, a ka patu ia rua hēkona. E rima taranata te taumaha o te pūrere o te karaka i roto i tētahi ruma i raro iho.  Pātai: whakaingoatia tētahi o ngā roia.
Ko Edmund Beckett Denison