Vaviri vevaFrench vanoongorora nyeredzi vanonzi Pierre Bouguer naCharles Marie de La Condamine ndivo vakatanga kuedza kuedza, vachiita zviyero zvavo pagomo reChimborazo muEcuador muna 1738. Rwendo rwavo rwakabva kuFrance kuenda kuSouth America muna 1735 kuyedza kuyera kureba kwe meridian arc yeimwe degree ye latitude padyo neiyo equator, asi vakatora mukana wekuyedza kuyedza kuyedza kuyedza. Muna Zvita 1738, pasi pemamiriro ezvinhu akaoma kwazvo enzvimbo nemamiriro ekunze, vakaita zviyero zviviri pakukwirira kwe4,680 uye 4,340 m. Bouguer akanyora mupepa ra1749 kuti vakakwanisa kuona kutsauka kwemasekondi masere, asi akarerutsa kukosha kwemhedzisiro yavo, vachiratidza kuti kuyedza kwaizove kuri nyore kuitiswa muFrance kana pasi pemamiriro ezvinhu.
4,680 uye 4,340 m