 
 <translate> The relevant sentence in the passage is: In the UK, the Ordnance Datum (the 0 metres height on UK maps) is the mean sea level measured at Newlyn in Cornwall between 1915 and 1921. So the answer is Newlyn in Cornwall between 1915 and 1921. <hau> Hukuncin da ya dace a cikin nassi shine: A cikin Burtaniya, Ordnance Datum (tsayin mita 0 a kan taswirar Burtaniya) shine matsakaicin matakin teku da aka auna a Newlyn a Cornwall tsakanin 1915 da 1921. Amsar ita ce Newlyn a Cornwall tsakanin 1915 da 1921. 