PREFACE. 



This book is intended to provide a short course in the calculation 

 of stresses in framed structures and to give a brief discussion of mill 

 building construction. The book is intended to supplement the elemen- 

 tary books on stresses on the one hand, and the more elaborate treatises 

 on bridge design on the other. While the book is concerned chiefly 

 with mill buildings it is nevertheless true that much of the matter will 

 apply equally well to all classes of steel frame construction. 



In the course in stresses an attempt has been made to give a 

 concise, logical and systematic treatment. Both the algebraic and graphic 

 methods of calculating stresses are fully described and illustrated. Each 

 step in the solution is fully explained and analyzed so that the student 

 will get a definite idea of the underlying principles. 



Attention is called to the graphic solutions of the transverse bent, 

 the portal and the two-hinged 1 arch, which are believed to be new, and 

 have proved their worth by actual test in the class room. The diagram 

 for finding the stress in eye-bars due to their own weight is new, and its 

 use will save considerable time ii designing bridges. 



In the discussion of mill building construction the aim has been to 

 describe the methods of construction and the material used, together 

 with a brief treatment of mill building design, and the making of esti- 

 mates of weight and cost. The underlying idea has been to give 

 methods, data and details not ordinarily available, and to discuss the 

 matter presented in a way to assist the engineer in making his designs 

 and the detailer in developing the designs in the drafting room. Every 

 engineer should be familiar and be provided with one or more of the 

 standard handbooks, and therefore only such tables as are not ordinarily 

 available are given. 



