PART I. 



LOADS. 



The loads to be provided for in designing a mill building will de- 

 pend to a large degree upon the use to which tlje finished structure is 

 to be put. The loads may be classed under (i) dead loads; (2) snow 

 loads; (3) wind loads; and (4) miscellaneous loads. Concentrated floor 

 and roof loads, girder and jib crane, arid miscellaneous loads should 

 receive special attention, and proper provision should be made in each 

 case. No general solution can be given for providing for miscellaneous 

 loads, but each problem must be worked out to suit local conditions. 



CHAPTER I. 

 DEAD LOADS. 



Dead loads may be divided into (a) weight of structure ; (b) con- 

 centrated loads. 



The weight of the structure may be divided into (i) the weight 

 of the roof trusses 5(2) the weight of the roof covering ; (3) the weight 

 of the purlins and bracing; (4) the weight of the side and end walls. 

 The first three items, together with the concentrated roof loads, consti- 

 tute the dead loads used in designing the trusses. 



The weights of mill buildings vary so much that it is not possible 

 to give anything more than approximate values for the different items 

 which go to make up the dead load. The following data will, however, 

 materially assist the designer in arriving at approximately the propel 



