A lacquered and patinated brass transit theodolite Stanley, London, early 20th century The triform base with adjustable feet and threaded table for tripod fitting beneath rotating trunnion table with twin fine vernier scales calibrated to 10 second divisions visible through glazed apertures and with pivoted viewing lenses, the upper surface mounted with X and Y spirit levels and yoke to support the reversible telescope with filter to eyepiece, screw focus adjustment, cross wire and incorporating vertical circle calibrated in degrees with twin verniers and further spirit level, the trunnion table engraved STANLEY LONDON, 30143, PATENT, 36cm (14.25ins) high; with original hardwood box with pasted trade label annotated with matching serial number and dated 15.4.32 to inside of lid, the main compartment incorporating section fitted with accessories, 47cm (18.5ins) wide. The firm of W.F. Stanley and Co. was founded by William F. Stanley as specialising in drawing instruments in 1854. The firm expanded to become one of the largest suppliers of surveying instruments working from several addresses in London and continued in business (latterly as a subsidiary of Russell Instruments) until being wound-up1999.