Sentence:  In trumpets for assisting the hearing, all reverbation of the trumpet must be avoided. It must be made thick, of the least elastic materials, and covered with <WSD>cloth</WSD> externally. For all reverbation lasts for a short time, and produces new sounds which mix with those which are coming in. 
Meaning of the word marked with <WSD> tags:  A woven fabric such as used in dressing, decorating, cleaning or other practical use.