— 208 — 
Brackets tor connecting intermediate struts to posts or lower portal struts to 
batter braces may be made of 2|" x 一 4.9 1 * angle iron : those for connecting 
upper lateral struts to posts may vary from the same size for short panels and low 
trusses to that of x — 8.8* angle irons for long panels and deep trusses. 
Those for connecting portal struts to batter braces when there are no portal vibra- 
tion rods may vary from So x 3" — 5.9, angles for 70' span to 4" x 5" — 22* angles 
for 150 , or 1G0’ spans. The larger these brackets the greater tlie number of rivets 
necessary for their attachment, and the greater the diameter of tlie rivets. In pro- 
portioning brackets ifc is well to err on the side of safety. 
Brackets for connecting track stringers to floor beams may be made of 8" or 
9" liglit channels, and those for connectiug floor beams to top cliords in deck bridge 
of 6” or 7" light channels. 
The sizes of beam hangers are given iu Table YII. 
The diameters of rollers may vary fi.om 2" for short spans to 8 /7 for long cmeö, 
the spaces between them being about an inch and tlieir length nearly equal to the 
width of the shoe plate. 
Slioe pin supporting pieces should be made of heavy I-beam with thick web. 
Tlie anchor pieces for sides of roller plates should not be made less than \ 
thick, and should be as loiag as the roller plates. 
Stringer bracing frames may be maxie of 3" x 3" — 7.2 n angle iron: the same si が 
may be advantageously employed for stiffening angles of track stringers and flo° r 
beams, though somewhat lighter sections may often be employed. 
Stringer supporting shelves may be made of 4" x 6" — lö tt angle iron. 
Splice plates for webs of track stringers 81101 üd be 吾 " thick, as deep as possible ； 
and wide enough for four rows of rivets : those for tlie flanges should have a sß°" 
tional area a little greater than that of the flanges themselves and should be lo^S 
enough to contain at least a dozen rivets on each side of the joint. 
The rest of the details on the list of members have either been so fully treated 
elsewhere or are so simple in their construction that their sizes may be readily detei* - 
mined without any further explanation. 
