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Substantial iron casting levelling screws, protected circular scale of 150 mm diameter, readable by two opposite verniers to one minute of an arc, reading lens provided. Achromatic object glass 178 mm focal length, 25 mm clear aperature, 8x Ramsden eye piece, cross line graticule. Focusing by rack and pinion. the telescope and the prism table can be rotated independently of each other, fitted with fine motion tangent screws for finer adjustment of the telescope on prism table, prism table provided with 3 spring loaded levelling screws, length of the prism table adjustable, surface of the table marked with parallel straight lines and concentrc circles to facilitate levelling of the prism.
complete with prism clamp and grating holder, in case.