<prompt> Yakha inguqulo eyinkimbinkimbi yalesi sigwebo UmWelshman ubengumuntu obhekele kakhulu ukuqedela isigaba seGreat Trigonometric Survey yaseNdiya eceleni kwe-meridian arc kusukela eningizimu yeNdiya eqhubeka enyakatho iye eNepal, ibanga elingamakhilomitha angaba ngu-2400.  <response>: Yiqiniso, inguqulo eyinkimbinkimbi yomusho ithi UWelshman wayephethe kakhulu ekuqedeni isigaba se-Great Trigonometric Survey of India eceleni kwe-meridian arc kusukela eningizimu yeNdiya eqhubeka enyakatho kuya eNepal, ibanga elingama-2500 mmeters urvey yaqala uWilliam Lambton ngo-1806 futhi yathatha amashumi eminyaka ambalwa. 