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Detail of the Ordnance Survey trigonometrical station on the summit of Artlecrag Pike, commonly referred to as Branstree, marked by a concrete ring inscribed ‘Ordnance Survey Trigonometrical Station’. Named by the Ordnance Survey as Selside Brow (the slope of land to the south), the conical brass bolt in the centre of the ring marking the precise location of the trigonometrical station is set into a concrete block. The trigonometrical station marks a point 711.098m above sea level (Ordnance Datum Newlyn) last levelled in 1961 (location photograph NY4709 : The summit of Branstree).