The cylindrical tube moves under friction inside a drum with the eyepiece and lens at the ends for coarse focusing. The drum also bears the manufacturer's inscription: "John Browning. London." It is held in place by the back pillar. The latter forms the instrument's supportive base together with 2 straight legs. The pillar also supports the quadrangular stage with its large central hole and 2 clips. Further along the optical axis is the plane mirror.
John Browning (c. 1831–1925) was an English inventor and scientific instrument maker renowned for the advances he brought to optometry, astronomy, and other fields. He started working with his father and, in 1856, took over the John Browning & Co company, which he led until 1900 when it was absorbed by Watson & Son. John Browning retired in 1905 and died in 1925.
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