398 



STRUCTURAL DRAFTING. 



CHAP. XII. 



dotted lines, or in red, sufficiently to indicate the clearance required or the nature of the connection. 

 Plain building work is exempted from this rule. 



A diagram to a small scale, showing the relative position of the member in the structure, 

 shall appear on every sheet, Fig. 8 and Fig. 9. The members detailed on the sheet shall be shown 

 by heavy black lines, the remainder of the structure in light black lines. Plain building work is 

 exempt from this rule. 



CONVENTIONAL SIGNS FOR RIVCT5 



*-^ 



FIG. 10. CONVENTIONAL SIGNS FOR RIVETS. 



When part of one member is detailed the same as another member, figures for rivet spacing 

 need not be repeated; refer to previous sheet or sheets, bearing in mind that these must contain 

 final information. It is not permissible to refer to a sheet, which in turn refers to another sheet. The 

 section, finished length, and the assembling mark for each member shall be shown on every sheet. 

 Main dimensions which are necessary for checking, such as c. to c. distances, story heights, etc., 

 shall be repeated from sheet to sheet. Holes for field connections must always be located inde- 

 pendently, even if figured in connection with shop rivets; they shall be repeated from sheet to 

 sheet unless they are standard, in which case they shall be identified by a mark and the sheet 

 given on which they are detailed. 



The quality of material, workmanship, size of rivets, etc., shall be specified on every sheet as 

 far as it refers to the sheet itself. Standard workmanship need not be specified on each sheet. 



Lettering. Engineering News lettering as developed by Reinhardt in his book on freehand 

 lettering shall be used on all drawings. Preferably main titles and sub-titles shall be vertical 

 and the remainder of the lettering inclined. The height of letters shall be as follows: Main titles 

 capitals 15/50 in., small capitals 12/50 in.; sub-titles capitals, full height lower case letters and 

 numerals 5/20 in., lower case letters 3/20 in. ; other lettering capitals, full height lower case letters 

 and numerals 5/30 in., lower case letters 3/30 in. Where the drawing is crowded the body of the 

 lettering may be 5/40 in. and 3/40 in. respectively. The following pens are recommended : For 



