24 STANDARD SPECIFICATIONS 



as possible, parallel to its central plane, the maximum inclina- 

 tion of any bar being limited to 1 in. in 16 ft. 



Adjustable eye-bars, when used as counters, shall have the 

 screw ends upset and shall be provided with turnbuckles, or with 

 sleeve nuts provided with holes drilled through two opposite faces. 



95. Rods. All rods shall have the loop ends forged and, 

 when used as counters, shall have the screw ends upset and shall 

 be provided with turnbuckles or special sleeve nuts. (Par. 94.) 

 The minimum size of all rods shall be one (1) sq.in. 



96. Compression Members. In compression members form- 

 ing chord segments as much as possible of the metal shall be 

 concentrated in the webs and flanges and the neutral axis shall 

 be as near as possible to the center of the web. 



In all compression members the minimum thickness of each 

 single web plate shall be one-fortieth (^) of the distance 

 between the inner lines of rivets connecting it to the flanges, and 

 when two or more plates form a compound web, the minimum 

 thickness of each plate shall be ^ in. (Par. 34.) 



The minimum thickness of cover plates shall be one-forty- 

 eighth (^g-) of the distance between rivet lines. 



The minimum thickness of flange angles, unsupported by 

 cover plates, shall be one-sixteenth (fa) of the width of the un- 

 supported leg. 



No compression member shall have a length exceeding 120 

 times its least radius of gyration, except those used for wind 

 and lateral bracing, which may have a maximum length of 140 

 times their least radius of gyration. 



97. Tie-Plates. (See Par. 40.) 



98. Lattice Bars. (See Par. 42.) 



99. Pins. (See Par. 43.) 



100. Pin Holes. (See Par. 44.) 



101. Column Bases in Trestles. Column bases shall be 

 made of plates and shapes riveted together, and no cast bases or 

 pedestals will be allowed, except when permitted by the engineer. 

 (Par. 84.) 



No metal in the bases shall be less than one-half () in. in 

 thickness and the base plates shall not be less than three-quarter 



(I) in. 



i The bases shall be placed on all bearing surfaces and so 

 anchored as to allow for expansion. 



