Set of D. Filby, Hamburg sextant and Rosell compass, 19th century. Metal, wood and paper. In original wooden boxes with damage. Faults and damages. Wear and tear due to use and time. Measurements: 12 x 32 x 29 cm (sextant box); 12 x 21 x 20 cm (compass box). Sextant "D. Filby Hamburg" in ebonised wood and brass, vernier with adjusting screw, three coloured filters for the fixed mirror and four for the movable mirror, observation telescope with optics. Contained in a damaged wooden box. The firm was founded by David Filby in 1837. It deals in nautical literature, nautical charts and nautical instruments imported from Great Britain. It also has a small tool repair shop. In 1862, Carl Plath, an expert instrument engineer, bought the company. The activity is increasingly focussed on the construction of sextants, compasses and barometers. The compass is signed on the inside paper Rosell-Barcelona. J. Rosell started the business in 1837; in 1879, after his death, ownership passed to his widow; there is an advertisement for Viuda de José Rosell with that date in Anuario-almanaque del comercio, de la industria, de la magistratura y de la administración. J. Rosell, "Gran establecimiento de instrumentos científicos", Guía Comercial de Barcelona, 1863.