CHAPTER III. 
LIST OF MEMBERS. 
In the following list of members will be found tho names of all the parts both 
of wood and iron in the bridges with which this treatise deals. Its use will be ex- 
plained in a subsequent chapter. 
List of the Different Members in a Wrought Iron 
Pratt or Whipple Truss Railroad Bridge. 
MAIN PORTIONS. 
/Top Gliorcls. 
Batter Braces. 
Posts. 
Upper Lateral Struts. 
Lower Lateral Struts. 
Cbaunels. Upper Portal Struts. 
Lower Portal Struts. 
Intermediate Struts. 
Bottom Chord Struts. 
Hip Verticals in Pony Trusses. 
、Side Braces. 
/Top Chords. 
Batter Braces. 
x Ü Bottom Chords. 
I Beams. 
Intermemate Struts. 
End Lower Lateral Struts. 
\ Track Stringers. 
'Top Chord Built Channels. 
- Batter Brace Built Channels. 
Post Built Channels. 
Angles. Side Braces. 
Floor Beams. 
Track Stringers. 
、Guard Rails. i：i 
Tees. I Side Braces. 
/Top Chord Upper Plates. 
Batter Brace Upper Plates. 
Webs of Built Channels. 
Plate. < Webs of Floor Beams. 
Webs of Track Stringers. 
Flanges of Floor Beams. 
\ Flanges of Track Stringers. 
/ Main Diagonals. 
Flats. Hip Verticals, 
t Chord Bars. 
/Counters. 
Rounds 
and 
Squares. 
Hip Verticals. 
Upper Lateral Rods. 
Lower Lateral Bods. 
Portal Vibration Rods. 
Intermediate Vibration Bods« 
* AVoight included iu that of Jb’lour Sytiteui Proper. 
