Theodolite - M. Guérin , équerre d’arpenteur XXL à boussole intégrée - 1890-1910 - France - Ancien , optique

An antique precision surveying square with integrated compass, from the house of M. Guérin, 2 rue de Constantine in Algiers. The instrument consists of a substantial brass cylindrical body equipped with several aiming slots, a upper graduated compass with indications of the cardinal points, and a removable optical sight.
This instrument was intended for surveying, arpentage and topography work, notably enabling alignment, determination of directions and orientation surveys on the ground.
The set is kept in its original wooden case with handle, bearing a brass plaque inscribed “INSTRUMENTS DE PRÉCISION – M. GUÉRIN – 2, rue de Constantine – ALGER”.
The Guérin house is historically documented in Algiers in the field of precision instruments and optics. Ancient sources notably mention Louis Guérin and then Guérin Jeune ;

Fine old scientific instrument showing**** a patina and signs of use / cracks on the case *** consistent with its age.
Estimated dating: late 19th century – early 20th century, around 1890-1910.