revision preference src: Using this measurement and the latitudes of the two cities they could calculate the distance between the North Pole and the Equator in classical French units of length and. Produce the first prototype metre which was defined as being one ten millionth of that distance. <SEP> tgt: Using this measurement and the latitudes of the two cities they could calculate the distance between the North Pole and the Equator in classical French units of length and hence produce the first prototype metre which was defined as being one ten millionth of that distance.