Beschreibung:

AN EARLY VICTORIAN LACQUERED BRASS THEODOLITETROUGHTON AND SIMMS, LONDON, CIRCA 1840The telescope with rack and pinion focus adjustment and fitted with spirit level to top, mounted within a frame positioned between two A-frame uprights incorporating a half circle adjusted for inclination via a rack and pinion and inset with silvered scale reading against a Vernier fixed at the base of one of the uprights, set on a circular brass revolving table applied with a glazed compass divided for degrees and labelled with eight cardinal points to centre as well as X and Y orientated spirit levels, the table signed Troughton & Simms, LONDON over a silvered Vernier sector with another to the opposing side for reading against the fixed canted silver ring to the circumference of the base calibrated for degrees of rotation divided for half degree increments, fitted with clamp and fine screw rotation adjustment over a column upright with elaborate triple-screw adjustable mount with threaded socket to underside, in original mahogany box with an additional eyepiece tube and a brass plumb weight.The instrument 22.5cm (8.75ins) high minimum, the tube 26cm (10.25ins) long with focus closed; the box 15cm (6ins) high, 29cm (11.5ins) wide, 22.5cm (8.75ins) deep. The partnership between Edward Troughton and William Simms is recorded in Clifton, Gloria Directory of British Scientific Instrument Makers 1550-1851 as formed in 1826 and operating primarily from addresses in Fleet Street, London. Edward died in 1835 followed by William in 1860; the business was subsequently continued by their successors until 1922 when the name was changed to Cooke, Troughton and Simms.