— 73 — 
section of the two splice plates connecting two channel bars must 
e at least equal to that of the larger channel. 
Simple reinforcing plates or plates rivet ted to webs at piu 
loles in order to compensate for strength lost there, or to pi-ovitle 
additional bearing for the pius must have as many rivets to attach 
iem to tlio webs af5 will give bearing and bending resistancor, for 
^ ame e ^ n ivaleut to afc least the greatest stresses that can come upon 
the 1，e mforciDg plates* 
Cover plates for top chords or batter braces are to have the 
section as the chord or batter brace plate, tlie joints in which 
y cover, ami enough rivets on each side of every joint to take up 
16 ö ie atost stress that could ever come upon the cover plato. 
• Extension plates on tlie end of a strut, for the purpose of liing- 
卜 tlie latter, are to have from the pin holes to tlio nearest edges 
le s ^ a y plates at least twice tlie sectional area of the strut, ami 
? e thickness must be sufficient to give proper bearing upon the 
う 1 :; The length of the extension plates is to be such as to allow 
xe Use of enough rivets to provide tlie proper bearing and bcml- 
resistances. 
^ The thicknesses of shoe plates autl roller plates for batter 
1 a ?° c ^ an uela of tlio various depths are to be taken from the fol- 
l0 ^ng table 
Depth of Channel. 
Less than 
デ 
9 /y and io° 
12 〃 
ず 
Built 
Channel.-;. 
Thickness of Plate. 
r 
r 
\" 
>r 
ず 
g r , et ^ Plates afc pedestals must be of such dimensions that tlio 
(200 、 Pressure on tlio masonry shall not exceed two hundred 
as . j P° nU( ^s per square inch, and the thickness is to be the samo 
of tlie shoe plate resting tlioreon. 
incl f】' am ^ a,1 ^ Gr plates aro 'never to be made less than one (l) 
* ' ilc 、 and their avec^s are to be such that the lianger nuts will 
Wa 【 s Uave a full bearing thereon. 
fön tlVe ド わ 1 top chord aiul batter brace plates shall bo spaced 
り 1 ) ( 】 i aiu etei.s apart for a distance on each siile of evci y joint 
i to one ami a Jialf (H) times the width of tlio pln-te, and no 
Q oi*e than five (Ö) inches elsewhere. 
l.i 6 L li s tance between the edge of any plate and tlio centre of n. 
dia i0 】 C mUS t ue ver be less than one and a half (1J) times tlie 
1 な】 010 ぐ 山 6 ホ “， Preferably twice the diameter. 
e diaiuetei* of the hole shall never exceed that of tlie rivet 
y 11101 e °ne sixteentli (y 6 ) of an incli, 
lleiufoiring Matesi. 
Cover riatci. 
Extension Plates. 
Shoo TM 丨 ite% Roller 
riates, nn<l Beil 
rittteH. 
Beam Han per riate<. 
nivittinp. 
