The opposite

Each time after the end of observation, the openings should be closed.

To simplify the subsequent processing of observations of the brand, it is necessary to place so that the scales are parallel to the axes of the barrel, an increase in digitization on the corresponding scales was the opposite of the increase in the coordinate X and the axles of the barrel and that the center of the brand and the installation point of the anti-aircraft industry are located approximately on the general vertical.