364 INDEX. 



ART. PAGE 



Equilibrium of Two Forces 31 37 



Of Three Forces 32 38 



The Laws of Chap. Ill 35 



Which Equations to Use 41 47 



Equivalent Loadings for Railway Bridges 142 286 



156 311 



Equivalent Static Stress. . . . ! 5 4 



Equivalent Uniform Live Load 126 234 



Estimates of Dead Load 125 233 



Euler's Formula 112 186 



External Forces 3 2 



Factor of Safety 24 26 



Fatigue 25 28 



Of Iron and Steel 28 30 



Fields of Shear in a Pratt Truss 153 298 



In a Truss 150 295 



Fink Roof Truss Stresses 56 75 



Fink Truss 118 207 



122 219 



Fixed End Beams, Moments and Shears 95 157 



Columns 112 184 



Flange Defined 2 2 



Of Girder 79 120 



Stayed against Buckling 68 95 



Flat End Columns 112 184 



Flaws or Cracks, Effect on Strength of Beams 89 140 



Flexure, Assumptions of the Theory of 68 94 



Of Column .' 110 179 



Theory of 68 92 



Theory Applicable to what Materials 68 94 



Floor Beam, Maximum Stresses 152 296 



Stresses Due to Curved Track 176 354 



Force Polygon 35 41 



Triangle 32 38 



Forces Acting on Structures 3 2 



Components of 30 37 



Concurrent 30 36 



Co-planar .' 30 35 



In Equilibrium: 



Two 31 37 



Three 32 38 



Four 33 39 



Any Number 34 40 



Line of Action of 30 35 



Non-concurrent 32 38 



34 39 



Parallel or Nearly Parallel. ... 37 42 



