Steinberg has shown that in the case of a thin film of metal formed by evaporation from a heated filament in a high vacuum the specific resistance and Hall coefficient are not the same as for the bulk metal. The metals investigated were silver, copper and iron, and in all of these the specific resistance was found to be about 1000% greater than in the metals in bulk. The Hall coefficients were slightly smaller for silver and copper than for the bulk metals, but for iron this coefficient was about 600% greater than the value generally accepted for iron. Also, the magnetic field necessary to produce saturation in the Hall electromotive force was considerably smaller for evaporated iron than for bulk iron. These differences he explained on the belief that evaporated films consist of granules not in such intimate contact as in the bulk metals which has the effect of increasing the resistance and changing the magnetic properties of the metal. On account of the bearing which this work might have on theories of magnetism and electric conduction, it seemed desirable to extend this investigation to other metals
