An information display device adapted to be mounted on the safety bar of a ski-lift chair. There is disclosed a towel which may include a pocket portion provided with adjacent, but slightly spaced portions or strips of an abrasive material disposable in overlying relationship for use in removing soil from balls and clubs. For a plurality of temperatures within the temperature cycle, the cellular ceramic body is irradiated with a modulated laser beam to generate acoustic waves in the cellular ceramic body over a plurality of acoustic paths. Exemplary applications include a field survey and inventory. The terminal station in turn will increase the transmission power in response to the control signals to widen the communication area.