— 204 — 
Tlio next group includes the connecting plates at the laps and intermediate 
panel points. The widths of the inner plates are, of course, equal to tlie depths of 
the cliannels wliicli they connect, and those of tlie outer ones as great as will peruaifc 
of tlieir lying between tlie heads of the rivets which pass through the flanges: in 
case of necessity some of these heads might be countersunk so as to permit of a greater 
depth of outer connecting plate. 
Tlie limiting thicknesses and lengths of these plates are given in tlie following 
table, which has been prepared under the assumption that Carnegie’s sections are 
employed and that the rivets are spacoa a 3 closely as good practice will permit. 
When applied to the hip connection, tlie lengths of these plates are equal to the 
sum of the distance from the centre of the pin hole to the end of the plate on the chord ， 
and that from the same point to the end of the plate on the batter brace. It must 
be understood that very heavy shallow channels are not used, but that the most 
economic size for tlie whole truss is in every case employed. 
Deptli of 匚 
Weight of 匸 
Thickness of Plate 
Total Length of Plate 
8" 
to 17 典 
3 2° to 44" 
ゲ ， 
14.5， to 21* 
s" to 
32" to 46 〃 
io w 
i6 ft to i 6 M 
to ^ 
32" to 48" 
12 ° 
20 s * to 45** 
i" to 
36 〃 to 66" 
15 " 
40** to 6o 4 
ä" to r 
4*2’* to 7。" 
The next on tlie list are the reinforcing and connecting plates at the pin 1101 es 
in bottom chord struts. Tlie former may always be made 蚤〃 thick and three or four 
inches deeper at tlio middle than the strut channels. Tiicu* length should be about 
three feet. Where a joint occurs in tlio bottom chord strut, the thickness of each 
connecting plate should be Y r f and the depth at tlie middle from four to six inches 
greater than that of the channel, tlie increase being directly proportional to the depth 
of the channel. A length of four feet will be generally about right. 
Next on tlie list come the reinforcing or connecting plates at the shoes. 
The thickness for these may be taken as -h* for eight aucl nine inch clnin- 
neh, i ,; for ten aiul twelve inches cliannels, and i ,f for fifteen inch channels. The 
height of each vertical portion may be taken equal to twice the depth of the batter 
brace cliannels, and the length of the horizontal portion about the samo or little 
more. 
Next come tlie reinforciug plates at the feet of the posts. If tlie channels be light, 
not greater in depth tlian twelve inches, and with flanges untrimmeil, a thickness 
of will bo sufficient for each inner and outer plate. For heavy sections of n.ny 
depth, for all fifteen inch cliannels, and for clianuela with their flanges trimuie^ 
away ifc will be well to increase the thickness to half an inch. The width of tbe 
outer plate sliould be inado as groat as will fit into tlie cliannels, and for small clifti 1 " 
n els it is well to make the horizontal portions of these plates wider than tlio vertief 
portions, so as to give room for attaching to the floor beam. The width of the inner 
plates should be at least as great as the depth of the post channels. If the latter b 0 
