Part IX of Dr. H. Grothe's series on the textile industry at the 1873 Vienna Exhibition, from the journal Engineering. It describes wool-carding machinery, card-cleaning (stripper-sharpening) apparatus and a new wool spinning machine exhibited by M. Celestin Martin of Verviers, Belgium. It also discusses the spinning experiments of Vimont and Sykes, and includes a table of yarn weights from a 360-spindle self-actor. Illustrations are engineering drawings of the carders, sharpening apparatus and spinning machine.