  A novel comparative technique enabling measurement of the magnetic
susceptibility of diamagnetic liquids with the "Moses effect" is presented. The
technique is based on the experimental establishment of the deformation of the
liquid/vapor interface by a steady magnetic field. The deformation of the
liquid surface by a modest magnetic field $(B\sim 0.60T)$ is measured with an
optical technique. The surface tension of the liquid is taken into account. The
magnetic susceptibilities of the investigated liquids (Ethanol and Glycerol)
were calculated from the maximal slope of the liquid/air interface. The
suggested approach yields an accuracy on the order of about $0.4-0.6\%$ and
hence is superior to previous methods which used the \textquotedblleft Moses
effect\textquotedblright\ for the same purpose.
