Single frequency measurements are obtained for the driving point admittance of a violin at three positions on the top of the bridge at directions parallel and normal to the top plate. Companion measurements of transfer admittance are taken from the top of the bridge to the body of the violin at the bridge feet. Phase measurements of the transfer admittance yield the phase relationship between the feet that indicates parallel or rocking motion of the bridge in its plane. These data are compared with data from other sources. The mechanical power input to the body of the instrument is calculated for an equivalent bow friction force.