In the paper the authors conducted a study on the determination of daily changes in the position of a slender object on example of a power pole. The size of the dynamic deflections was compared to variables of the effect of solar radiation and the wind speed and direction measured during research. To determine these parameters to-date measurements of temperatures on sunny and sheltered side of construction, direction and wind strength were performed. The attempt was made to determine the static deflection in order to compare them to the size of the maximum set forth in the technical standards. The measurement accuracy of the controlled points of the object was compared with values given in the technical instructions. The authors concluded that deformation measurements carried out in serve weather conditions gave more valuable information in terms of an object endurance. The research is the first step in lengthier measurements. The motivation for this paper is need of rebuild of electric high – voltage lines.

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