VI. PREFACE. 



Mr. Charnock of Bradford, for many of the test results and 

 illustrations; to the valuable works of Messrs. Kirkaldy, 

 Spretson, Skelton, Anderson, Butler, and Barlow, as 

 well as to the Minutes of Proceedings of the Institution 

 of Civil Engineers, the Iron and Steel Institute, the 

 Institution of Mechanical Engineers, British Association, 

 American Institutes of Civil and Mechanical Engineers, 

 and the Manchester Literary and Philosophical Society ; 

 to the engineering periodicals; "The Mechanical Engineer," 

 " Engineering," "The Engineer," and "Industries"; and, 

 lastly, to the following firms for the loan or gift of blocks 

 for illustration : Messrs. J. Buckton & Son, Leeds ; 

 Messrs. Greenwood & Batley, of Leeds ; Messrs. Daniel 

 Adamson & Co., Hyde ; Messrs. Charles Churchill & Co. ; 

 Messrs. Nalder Bros.; Messrs. Sir W. H. Bailey & Co., 

 Salford ; and Messrs. Eiehle Bros., Philadelphia. 



W. C. P. 



20, Kennedy Street, 



Manchester, January, 1901. 



