Schneider field gun sight
The Schneider field gun was equipped with collimateur with aiming circle and a spirit level mounted on a special support that could be easily mounted on the gun. The sighting apparatus was not placed on top of the arc sight, as in the German guns, but on a separate pedestal, mounted on a bar actuated by the laying wheel, independently of the elevating wheel.
The collimateur C consisted of a block of clear glass about
The spirit level N was used to obtain the angle of sight. It was put in the correct position shown on the sector ∑¹ by means of the milled head B¹. When the level difference was too great and ∑¹ the scale was insufficient, the layer moved slightly the collimateur by means of the milled head B², and read the additional correction on the scale ∑². To correct the little errors due to the breaking down of the gun, the air bubble should be constantly brought back between its marks. The spirit level could also be used to calculate the slope of the trunnions, turning 90° the movable wheel where it was placed.
The sighted ruler was pivoted on the aiming circle (goniometer) P, a circulated graduated base-plate, with every quadrant divided in 100 parts. A drum T, by means of an additional shifting of the pillar, permitted to obtain an azimuthal direction expressed in millièmes.
- BETHELL. Henry
Arthur : Modern Guns and Gunnery,
- CUREY. Charles
Marie : “L’artillerie Schneider-Canet à l’Esposition universelle de