The experiment investigates the electromagnetic effects of convection. The results show that the + and - rotation effects are not significantly different between the second and third trials, where the apparatus was disassembled and cleaned. The author suggests that the Poisson's relation between the two elastic constants of isotropic media, which is theoretically derived from the assumption of discrete molecules, does not hold for all materials. The author proposes that the molecules in crystals have some degree of polarity and interact with each other through forces that depend on the direction of their bond lines. This assumption is applied to both quasi-isotropic and isotropic media, but it fails to resolve the contradiction between theory and observation if the molecules are assumed to be in all possible orientations. The author concludes that the structure of quasi-isotropic materials, consisting of small crystalline fragments in various orientations, provides a better explanation for the observed behavior. The elastic constants of quasi-isotropic materials are derived from the elastic constants of homogenous crystals, considering the polar nature of the molecules. The author also discusses the limitations of the theoretical results and compares them with experimental data, finding some agreement but noting significant differences. The author suggests that the polar nature of the molecules may be less pronounced in most materials.The experiment investigates the electromagnetic effects of convection. The results show that the + and - rotation effects are not significantly different between the second and third trials, where the apparatus was disassembled and cleaned. The author suggests that the Poisson's relation between the two elastic constants of isotropic media, which is theoretically derived from the assumption of discrete molecules, does not hold for all materials. The author proposes that the molecules in crystals have some degree of polarity and interact with each other through forces that depend on the direction of their bond lines. This assumption is applied to both quasi-isotropic and isotropic media, but it fails to resolve the contradiction between theory and observation if the molecules are assumed to be in all possible orientations. The author concludes that the structure of quasi-isotropic materials, consisting of small crystalline fragments in various orientations, provides a better explanation for the observed behavior. The elastic constants of quasi-isotropic materials are derived from the elastic constants of homogenous crystals, considering the polar nature of the molecules. The author also discusses the limitations of the theoretical results and compares them with experimental data, finding some agreement but noting significant differences. The author suggests that the polar nature of the molecules may be less pronounced in most materials.