SPECIFIC A TJONS. 307 



and other machine work. Immediately after rolling, the several 

 parts shall be cleaned and assembled and all irregularities shall 

 be corrected. 



Rivet-holes shall be made to coincide accurately by reaming. 



Rivet-heads must be of uniform shape and size for the same 

 size rivets throughout. They must be full and neatly finished 

 and concentric with the rivet-holes. All rivets when driven 

 must completely fill the holes, the heads being in full contact 

 with the surface or counter- sunk when required. 



Whenever possible, all rivets shall be machine-driven. 



All portions of the work exposed to view shall be neatly finished 

 and all surfaces in contact shall be painted with pure red lead 

 and linseed-oil before they are permanently connected. 



Columns and other "built" members shall, as far as practi- 

 cable, be completely riveted at the shop, leaving only connecting 

 points, drilled to templet, to be secured in the field. Important 

 parts shall be plainly marked. 



FIELD ASSEMBLY. 



Upon arrival at the point of consignment, care shall be taken 

 in unloading all material, and parts damaged in transit shall be 

 rejected and promptly replaced. All material shall be properly 

 protected until ready for use. In assembling the parts, drifting 

 will be permitted only in exceptional cases and excentric holes 

 must be reamed and larger rivets shall be used when required. 



Rivet-calking will not be allowed and loose rivets must be 

 cut out and replaced. Calking seams must be entrusted only 

 to skilled workmen, using proper tools and exercising due diligence 

 to prevent injury to the under plate. Parts inaccessible after 

 erection, and including laps at joints, shall, immediately before 

 being riveted, be given a substantial coat of pure red lead and 

 linseed-oil. 



