284 



TIMBER BRIDGES AND TRESTLES. 



CHAP. VII. 



#* & 



'o/ /arc/race oofcs 



'ol/ar faces 2-3"x/0x/4'0 " 



Co/far braces 2-3x10x22-0 

 'ar bract bo/ts^xZI* * 



DfSCPlPT/ON 



3*IO'x/8'-0" 



12* 14x1 2-0" Cap 



I2"x 12x22-0" Posts 



'/2\l2xJ3^d 



Y'Sguare Drift Pins 30 "Long 

 \ " " dolt -j 22" - 



/2 Slotted 



10 Penny Wire Ngi/s 



1 PCS. 7'x/6x28 L 0~5tn'nqers 



"' - 6f8*'tO'-0"&rictc>f^~ 



Northern Lines on/v 



6 i x!4 " Southern 



16 Cast Iron Packing Washers 



6 Inset Washers Northern i/nes only 



6 Plain 



Southern 



\iottfg " 



'O Penny W/'re/Va/h 



Ban. 



it) 



m 



17$ 



720 



Wr. 



loft 



56. 



93. 



66.0 



\BD.FT. 



T&. 



w 



12.9 



4M. 



-ft. 



4.6 



^ 



Note'-" Note :- Order tnough extra Guard ii/ 



Material for bottom story to at/ow 2-0 "for each jpfice. 

 varies with height of bent. 



FIG. 3. PLANS OF TIMBER FRAME TRESTLE. ILLINOIS CENTRAL RAILROAD. 



j!0 tt jlo" -- , jlQ" fLQ" 



r7'*IS l 'Stringers, 10 per Pwef- 

 6"*8''6u3r<l Rail \ 3 



^Ai 



SI 



IMMMMMlL"/-^ fyi 

 -. < ?&?*' "^ ^* 



\5triogersmth *g"Boat\ TTreafed face Phnks to 

 \5plkes- Leave z"5pjce W\be left squarv msteaJ of\ 

 * between 5Mp and Cap y\ cuffing fo edge of Cap -^ ^ ^ 



|. 



.->. -S Ni 



for ^ ,-a; 

 -/-r^! 



-0' Ties, spaced 20' c- fo c- 



r6"*8" 6t/3rd Pail 



*, tJL / 



^y*r*lM\Plaaks, y 



CROSS 5ECT10H 

 Nofe '- AH timber fo be creosoted- 



T-^-ffLf^- \-7"xlM-6" Stringer* 5TANDARD FOUZ PlL 



Spiked with 60 Penny Wire V ?//,//, ,- -r- 



2 ^Ma dALLAST FLOOR TRESTLE 



ILLINOIS CENTRAL RAILROAD 



FIG. 4. PLANS OF TIMBER TRESTLE WITH BALLASTED DECK. 



.Nails, ?0 Nails per P/ank 



PLAN 



