SHOP-PRACTICE AND ERECTION. 2/9 



when cold by passing it through powerful steel rolls; this 

 is called " cold-rolling," and should always be specified. 



Such rolling should invariably follow the work of bevel- 

 ling and punching, better results being obtainable through 

 such process. 



Shop-assembly. Immediately after rolling, the various 

 separate parts of the structure should be assorted and " as^ 

 sembled," to insure a fair and satisfactory arrangement at the 

 point of erection. Where the rivet-holes do not match per- 

 fectly in the assembled parts, the rivet-holes should be made 

 to coincide and any eccentricity should be corrected by 

 reaming out the hole and providing for a larger rivet. 



After testing the several members during this " shop- 

 assembly," each piece should be regularly and carefully 

 marked, that no confusion may result at the time of " field " 

 or final assembly. 



Cleaning and Priming. Immediately after testing and 

 correcting the shop-work, the parts should be carefully 

 cleaned of all dirt, grease, mill-scale, or rust, as has been 

 explained, preferably by the use of the sand-blast, after 

 which, as has been suggested, a coating or priming should 

 be made with red lead, lampblack, and linseed-oil, and as 

 soon as sufficiently dry for handling, the material should be 

 carefully loaded into the cars, and consigned to the point of 

 erection. 



This class of work as above described is usually done by 

 any well-equipped boiler-works, and the shop-cost is about 

 $20.00 per ton, exclusive of painting. 



During the progress of the work, independent shop-in- 

 spection should be insisted upon and carried out by an ex- 

 perienced and reliable inspector whose fee would amount to 

 approximately 40 to 50 cents per ton of material, or about 

 $1.00 per ton for complete inspection and test at both mill 

 and shop. 



