CHAPTER XXVI. 

 SHOP DRAWINGS AND RULES. 



SHOP DRAWINGS. The rules for making shop drawings in 

 use by the American Bridge Company are given in their Standards for 

 Structural Details, and are reprinted in part, in Roofs and Bridges, 

 Part III, by Merriman and Jacoby. The following rules are essentially 

 those in common use by bridge companies, for mill buildings and ware- 

 houses. 



Make sheets for shop details 24 by 36 inches, with two border 

 lines, Y-2 and I inch from the edge, respectively. For mill details use 

 special beam sheets. The title should come in the lower right hand 

 corner, and should contain the name of the job, the contract number, 

 and the initials of the draftsman and checker. 



Detail drawings should be made to a scale of J^ to I inch to the 

 foot. Members should be detailed as nearly as practicable in the po- 

 sitions in which they occur in the structure. Show all elevations, sec- 

 tions, and views in their proper positions. Holes for field connections 

 should always be blackened. Members that have been cut away to show 

 a section, may be either blackened or cross-hatched. Members, the 

 ends of which are shown in elevation or plan, should be neither black- 

 ened nor cross-hatched. Holes for field connections should be located 

 independently, and should be tied to a gage line of the member. When 

 metal is to be planed, the ordered and finished thickness should be given. 



In making shop drawings for mill buildings two methods are in 

 use. 



The first method is to make the drawing so complete that templets 

 can be made for each individual piece, separately on the bench. 



The second method is to give on the drawings only sufficient di- 

 mensions to locate the interior of the members and the position of the 



