xi (#15) ############################################## ACKNOWLEDGMENTS It would not be seemly to publish this work without due acknowledgment to the Worshipful Company of Clothworkers of the City of London, who, through the excellently equipped Textile Industries Department of the University of Leeds, has provided the opportunity for developing, revising and testing so much of the work included in this volume. My personal thanks are also due to the following:- Dr. S. Brodetsky, for permission to use the Nomo- grams included in this work and for advice upon the mathematical section. Mr. G. Hollis, for looking through certain of the chapters in the Woollen Spinning Section. Mr. E. Priestley, for looking through certain of the chapters in the Worsted Drawing and Spinning Section. Mr. Henry Wilkinson, for the formula linking up the quality and diameters of wool fibres, and for other useful revisions and suggestions. Mr. Ellis Foster, for useful criticism of the data referring to sets of worsted machinery, and also for certain details respecting sets of machinery. Mr. N. R. Newsholme, for suggestions and particu- lars with reference to mechanical doffing. Mr. R. C. Taylor, for supplying his own and the late Mr. Auty's notes on "Carding." . Mr. S. Smith, for notes on "Carding." Mr. W. E. King, for constructing the diagram illustrating the angle of twist in yarns. 1
155 156 Textile Machine