CLEARANCE STANDARDS. 



413 



Ixo- 



18 



< /77 , /77 



K *- 



Clearance "a" should never be less khan? 



Clearance "b" should never be less than f'From center line bo each piece, and 

 where possible should bej> 



Clearance "h" should never be /ess than ^" and as a rule should be I 

 Always give figure For distance n m"on detail For use oF checker 

 When standard Framing angles are used, make "m"=6^ M ' 

 Clearances given should be allowed fn addition to overrun oF angles 



FIG. 22. CLEARANCE STANDARDS. AMERICAN BRIDGE COMPANY. 



