Stay riatcs. 
— 72 — 
Lattice anti Lacing 
Bara. 
Diameters of Rivets 
for Different Chan- 
nels. 
Built Channels. 
Splice Plates. 
Sizes of stay plates are to be taken from Table XXII or XXIII. 
Stay plates on latticed or lacod compression members are to bo 
placed as near the pin holes or ends of strut as possible. 
Latticing or lacing must never be used without stay plates at 
the ends. 
Sizes of lattice and lacing bars are to be taken from Tables XX 
and XXI. Lattice bars shall make with each othor, as nearly as 
circumstances will permit, angles of ninety (90) degrees, and lacing 
bars angles of sixty (60) degrees. 
Tlie ends ot lattice bars and single rivetted lacing bars arc to 
be semi- circular, tlie centre being taken a little outside of the outer 
edge of tlie rivet hole. 
Foi. attaching plates and lattice or lacing bars to the flanges 
of channels tlie least diameters of the rivets to be used are to be 
taken from tlie following table ; and the greatest diameters must 
not exceed those there given by more than one eighth (^) of an incli. 
Depth of Channels. 
4" 
5" 
6" 
7" 
8" 
r 
I 。" 
じ〃 
15" 
Dia. of Rivets. 
r 
r 
i" 
10 
r 
w 
■w 
r 
Channels built of plates and angles are not to be less than 
eighteen (18) inches in depth, nor have webs less than one half 
( 去 ) inch thick, nor flanges less than three (8) inch by four (4) 
inch angles weighing tlnrtoen (18) pounds per lineal foot, the 
shorter logs to be rivetted to the web. For all built channels there 
are to be employed, instead of tlie ordinary latticing or lacing bars, 
pieces of angle iron having dimensions not less than two (2) inches 
by tlirec and a quarter (8J) inches by a quarter (J) of an iuch or 
weighing four and two ton tbs (4-^) pounds per lineal foot, used as 
lacing bars and attached to tlie flanges of the built cliaimels by 
two-staggered rivets at each ernl. 
Tho length of a splice plate is to be determined by the number 
of rivets necessary to transfer the stress from one main member to 
tlio other : the sum of tho working bearing resistances of all tho 
rivets on either side of tho joint must not be less than tlie stress 
in the main member upon that side. The rivets must also bo 
figured for bending. 
When practicable, a splice plate must be placed on each side 
of every member where a joint occurs. 
The transmission of compressive stresses shall be considered 
as entirely through tlie medium of the rivets anil connection plates, 
ami these must be proportioned accordingly ； so that the area of tlie 
