18 



clined at an angle not less than 60 to the axis of the mem- 

 ber for single latticing, nor less than 45 for double latticing 

 with riveted intersections. The pitch of the latticing must 

 not exceed the least width of the member plus nine inches. 



98. Where necessary, pin-holes shall be reinforced by 

 plates, some of which must be of the full width of the 

 member, so the allowed pressure on the pins shall not be 

 exceeded, and so the strains shall be properly distributed 

 over the full cross-section of the members. ( 41.) These 

 reinforcing plates must contain enough rivets to transfer 

 their proportion of the bearing pressure, and at least one 

 plate on each side shall extend not less than six inches 

 beyond the edge of the batten plates. ( 97.) 



99. Where the ends of compression members are forked 

 to connect to the pins, the aggregate compressive strength 

 of these forked ends must equal the compressive strength of 

 the body of the members. 



100. In compression chord sections and end posts, the 

 material must be mostly concentrated at the sides, in the 

 angles and vertical webs. Not more than one plate, and 

 this not exceeding -J inch in thickness, shall be used as a 

 cover plate, except when necessary to resist bending strains 

 or to comply with 80. ( 42.) 



101. The ends of all square-ended members shall be planed 

 smooth, and exactly square to the centreline of strain. 



Floor Beams io2. The ends of all floor beams and stringers shall be 



s ' faced true and square, and to correct lengths. Allowance 



must be made in the thickness of the end angles to provide 



for such facing without reducing the required effective 



strength of such end angles. ( 83.) 



103. All members must be free from twists or bends. Por- 

 tions exposed to view shall be neatly finished. 



104. Pin-holes shall be bored exactly perpendicular to a 

 vertical plane passing through the centre line of each mem- 

 ber, when placed in a position similar to that it is to occupy 

 in the finished structure. 



105. The several pieces forming one built member must 

 fit closely together, and when riveted shall be free from 

 twists, bends or open joints. 



