This paper treats the cases of a single and two orthogonal conductive spheres, situated in homogeneous electrostatic field. It starts from electrical image charge with respect to single sphere or orthogonal spheres. Determining the value and position of the image charges is done using geometrical methods based the Kelvin transform. The homogeneous electrostatic field is obtained from the displacement to infinity of the punctiform charge which is located outside the considered spheres.

Keywords: Electrical charge, Electrical images, Kelvin transform, Inversion method, Orthogonal spheres