early 19th century surveyor's side bubble level by Rochette - no theodolite

Description

early 19th century
surveyor's side bubble level by Rochette
signature on the instrument: "ROCHETTE j.ne quai de l’ Horloge a Paris"
manufacturing date: early 19th century
Instrument  with astronomical telescope, silk thread reticle; 20 mm aperture, 31 cm length, shooting focus;
This instrument is equipped with a particular system for setting "in station", consisting of only two leveling screws
which act in contrast between two plates, inside which a system of springs is installed that act in place of the third screw. It is hinged on the upper plate
the crosspiece at the ends of which the two forks that accommodate the telescope are placed; the large bubble is installed on the side.
brass instrument, in good condition considering its age: look the photos
walnut wooden box with some accessories; size: cm 36,5 x 16,5 x 11,5