SPECIFICATIONS 



407 



102. The heads of eye-bars shall be made by upsetting, 

 rolling, or forging into shape. Welds in the body of the bar 

 will not be allowed. 



103. The bars must be perfectly straight before boring. 



104. The holes shall be in the center of the head and on 

 the center line of the bar. 



105. All eye-bars shall be annealed. 



1 06. All abutting surfaces in compression members shall 

 be truly faced to even bearings, so that they shall be in such 

 contact throughout as may be obtained by such means. 



107. Pin holes shall be bored truly parallel with one an- 

 other and at right angles to the axis of the member unless 

 otherwise shown in drawings ; and in pieces not adjustable for 

 length, no variation of more than 1-64 of an inch for every 

 20 feet will be allowed in the length between centers of pin 

 holes. 



1 08. Bars which are to be placed side by side in the 

 structure shall be bored at the same temperature, and shall be 

 of such equal length that, upon being piled on each other, the 

 pins shall pass through the holes at both ends at the same time 

 without driving. 



109. All pins shall be accurately turned to a gage, and 

 shall be straight and smooth. 



no. The clearance between pin and pin hole shall be 1-50 

 of an inch for pins up to 3^ inches in diameter, and 1-32 for 

 larger pins. 



in. All pins shall be supplied with steel pilot nuts, for 

 use during erection. 



QUALITY OF MATERIAL. 



Forged Work 

 Eye-Bars. 



112. All steel must be made by the open hearth process, 

 and if by acid process, shall contain not more than 0.08 per 

 cent of phosphorus, and if by basic process, not more than 0.06 

 per cent of phosphorus, nor more than 0.05 per cent of sul- 

 phur, and must be uniform in character for each specified kind. 



113. The finished bars, plates and shapes must be free 

 from injurious seams, flaws, or cracks, and have a clean 

 smooth finish. 



Machine Work 

 Facing. 



Pin Holes. 



Pins. 



Play in 

 Pin Holes. 



Pilot Nuts. 



Process of 

 Manufacture. 



Finish. 



