Ben Nevis the summit only to find "fragments of earthen and glass ware, chicken bones, corks, and bits of paper". It was not until 1847 that Ben Nevis was confirmed by the Ordnance Survey as the highest mountain in Britain and Ireland, ahead of its rival Ben Macdhui. The summit observatory was built in the summer of 1883, and would remain in operation for 21 years. The first path to the summit was built at the same time as the observatory and was designed to allow ponies to carry up supplies, with a maximum gradient of one in five. The opening of
Ben Nevis Observatory Gully holding snow until September most years and sometimes until the new snows of the following season. The first recorded ascent of Ben Nevis was made on 17 August 1771 by James Robertson, an Edinburgh botanist, who was in the region to collect botanical specimens. Another early ascent was in 1774 by John Williams, who provided the first account of the mountain's geological structure. John Keats climbed the mountain in 1818, comparing the ascent to "mounting ten St. Pauls without the convenience of a staircase". The following year William MacGillivray, who was later to become a distinguished naturalist, reached