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Measurements of total power loss and domain wall have been made on individual grains in polycrystalline specimens of commercial grain-oriented 3% silicon-iron at frequencies from 20 to 160 Hz and flux densities up to 1.3 T with applied longitudinal tensile stress of up to 12 MPa. The effect of tension on domain wall spacing and velocity has been investigated. The measured wall velocities have been correlated to the measured power loss and change of power loss with tensile stress is described and explained by considering the domain wall spacing and wall velocities. The effect of tensile stress on domain wall bowing has been investigated and it is suggested that the change can be explained by the ruckling process.