A chuck includes a generally cylindrical body having a nose section and a tail section. Thereby, in the case where the image processing apparatus is caused to cooperate with other apparatus via a communication line, a more user-friendly operation for the cooperation can be provided with the security of the image processing apparatus protected compared to conventional systems. A control signal is then determined by the control circuit based on the rectified signal and supplied to a variable attenuator to increasedecrease power of the transmission wave. The slurry optionally is worked through a recycle stream, an accumulator tank, or both.