The theodolite box contains descriptions for use and the manufacturer. A theodolite is an instrument used for measuring angles for surveying. It consists of sight binoculars and a protractor for determining angles, as well as small lenses. This box belongs to a portable theodolite, which was used on the Maud Expedition 1918-1925. It was one of six theodolites they had on board at departure in 1918, and a favourite of Harald Ulrik Sverdrup.