Abstract: In a process for exposing a photosensitive layer formed upon the inside of the faceplate of a color-picture tube so as to form a desired pattern of phosphor dots or temporary dots or the like, an optical correction system for causing the light beam to precisely impinge at a point where the electron beam impinges is interposed between a light source and a shadow mask. The system comprises an optical lens system for correcting .DELTA.S deviation characteristics and an optical lens system for correcting .DELTA.P deviation characteristics consisting of a first optical correction system and a second optical system. The first optical system is so designed as to attain the average correction depending only upon the deflection angle regardless of each of the radial directions of deflection while the second optical system is so designed as to attain the individual .DELTA.P deviation characteristics depending not only upon the deflection angle but also upon each of the radial directions of deflection.

Abstract: A method of preventing a raw mix disposed on a pallet of a moving grate type sintering machine from being unevenly sintered in the transverse direction extending across the width of the sinter and an apparatus for carrying out the method are disclosed. The raw mix is fed on moving pallets which form the bed. The temperature distribution of waste gas soon after it has passed through the bed in a direction perpendicular to the bed is measured at the sinter exit side of the sintering machine. The temperature thus measured is utilized to adjust the amount of raw mix to be delivered from a surge hopper upon the pallet and adjust the density of the packed layer and hence correct the gas-permeability of the bed and the sintering effect upon the bed in its transverse direction. Thus, the sintering bed is prevented from being unevenly sintered by the sintering machine.