Russian empire. Goniometer artillery siege, fortress and coastal guns 1902, Sestroretsky plant. Artillery goniometer - part of the angle measuring devices in the sighting devices of artillery guns, in the means of orientation and reconnaissance. According to the goniometer, the gun is guided in a horizontal plane by means of a rotary mechanism when firing at an unobservable target.
Bronze, steel, glass. In perfect condition. The size of the box 210*210*110 mm. The device was in service with the Finnish army, as evidenced by the "SA" brand.