一 75 — 
• Webs and flanges of floor beams, track stringers and plate 
girders must be well spliced at all joints by a plate on each side of 
the patfc spliced. 
There is to be line of track stringers directly uiulei* each rail. 
They are to be very firmly attached to the floor beams, and at 
10 eu (I s of the span are to revsfc upon and slide in grooved bed 
Plates, or some similar detail. 
Tracjc stringers over fifteen feet in length must be braced by 
ai 】 gl? iron frame or frames placed transversely to the span and 
l^üly rivet bed to tlio webs of tlio parallel stringers. Where tlie 
? Un gei.s rest upon tlie tops of the floor beams, there must be a brac- 
ln g frame near each end of each pair of stringers. A similar bracing 
\ the frames not tnoro than seven (7) feet apart will suffice for 
ate givclcr spans not exceeding twenty- five (25) feet, but bcyontl 
, la l ei 】gtli there must bo provided diagonal bracing of angle iron 
) 0 1 above and below, the braces making with each other angles of 
= out sixty ((JO) degrees. Tliere must be also a stout bracing 
lame at eacli ead of the span. 
Plate girders and built stringors are not to ha ve a depth less 
ご 1 ) 0ue ” teutli (tV) of the span wliorever the headway beneath the 
track will 
permit the use of such a depth. 
The flange-plates of all girders must be limited in width so as 
fo to extend beyond tlio outer lines of rivets connecting them to 
tlir] ail gl eS 1X1016 than five inches oi, more tlian eiglit times the 
ii le ^ lless of Uie first plate. "Where two or more plates are used on 
. 1G an ges, they shall either be of equal thickness or shall decrease 
11 lc ^ uess outward from tlie angles. 
1 we ]dcd heads tlie length of metal behind tlio pin must be at 
^ as e( l ua l to the diameter of tlie pin: while in hammered heads, 
10 ara °unt is to be the same as that above or below the pin. 
Tlie least amomifc of metal in the heads across the pins is given 
瓜 tlie following table . 
卿 th of Bar. 
Metal in Head. 
Across Pin. 
Diameter of Pin. 
〜 —— 一 
Welded. 
Hammered. 
I 
0.80 
1.50 
1.50 
1.04 
1.50 
1.50 
1.12 
1.50 
M 3 
1.20 
1.50 
1.56 
1.28 
1.50 
1.60 
1.36 
1.55 
1.72 
1.43 
1.60 
1.76 
1.50 
1.67 
1.85 
r.64 
1.67 
1.95 
1.77 
1.70 
2.05 
1.90 
1.76 
2.21 
1 s Pecifications of Theodore Cooper Esq., C.E. 
Splices iu Floor Beams 
&c. 
Track Stringcri, 
Bracing for Track 
Stringers nml Plate 
Girders. 
Limitiug Doptlui . cf 
CJ irdcTij & S tringcr.5. 
Flftnprc Plates of C4ir- 
dew ， 
Eyes. 
