The paper presents a method of using the plumb line deflection and the prior information about the density of topographic masses in a model of the disturbing potential. The model of the disturbing potential relays on the lower-degree harmonic spherical polynomials and on the local density model of topographic masses and was presented in a previous research. The formulas closed in the paper may be used to determine of topographical corrections of the plumb line deflection assuming the linear variation of the density of topographic masses. Furthermore, some conclusions about the influence of a density of topographic masses on a deflection of the vertical have also been presented

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