TABLE OF CONTENTS. 



CHAPTER VIII. STEEL BINS. 



Stresses in Bin Walls 299 



Stresses in Shallow Bins 299 



Algebraic Solution 299 



Pressure of Bituminous Coal 303 



Pressure of Anthracite Coal 304 



Pressure of Sand 305 



Pressure of Ashes 306 



Tables of Pressures on Vertical Bin Walls 302 



Stresses in Shallow Bins, Graphic Solution 307 



Hopper Bin, Level Full 307 



Stresses in Framework 307 



Hopper Bin, Top Surface Heaped 307 



Stresses in Suspension Bunkers 309 



Stresses in Deep Bins 311 



Data for Design of Bins 311 



Weight of Materials 311 



Angle of Repose of Materials 311 



Angle of Friction on Bin Walls 312 



Self Cleaning Hoppers 312 



Design of Bins 312 



Flat Plates 312 



Buckle Plates 315 



Types of Bins 316 



Suspension Bunkers 316 



Hopper Bins .. 316 



Circular Bins 317 



Examples of Bins 317 



Steel Suspension Coal Bunkers 317 



Steel Hopper Ore Bins 318 



Steel Hopper Coal Bins 318 



References 318 



CHAPTER IX. STEEL GRAIN ELEVATORS. 



Introduction 319 



Stresses in Grain Bins 319 



Stresses in Deep Bins 319 



Janssen's Solution 319 



Data for Design of Steel Grain Bins 321 



Coefficients of Friction of Wheat on Bin 



Walls 321 



Ratio of Lateral to Vertical Pressures of 



Wheat 321 



Hyperbolic Logarithms 322 



German Practice in Design of Grain Bins. 324 

 Load on Bin Walls 324 



Experiments on the Pressure of Grain in 



Deep Bins 325 



Rectangular Steel Bins 326 



Circular Steel Bins 326 



Rivets in Horizontal Joints 326 



Stresses Due to Wind Moment 327 



Stiffeners 327 



Steel Country Elevator 329 



Independent Steel Elevator 329 



Costs of Steel Grain Elevators 337 



References 338 



CHAPTER X. STEEL HEAD FRAMES AND COAL TIPPLES. 



Types of Head Works for Mines 339 



Methods of Hoisting 339 



Hoisting from Deep Mines 341 



Hoisting Ropes 341 



Strength of Wire Rope 342 



Working Load on Hoisting Rope 342 



Bending Stresses in Wire Rope 344 



Safe Working Stresses in Round Wire 



Ropes 345 



Safe Working Stresses in Flat Wire Rope. 346 



Cages, Skips, Sheaves, Safety Hooks. . . 346 



Examples of Steel Head Frames 346 



Diamond Steel Head Frame 347 



New Leonard Steel Head Frame 347 



Tonopah-Belmont Steel Head Frame . . 348 



Data on Steel Head Frames 350 



Estimate of Weight of Steel Head Frame. 352 



Coal Tipples 352 



Sizing Coal 352 



Types of Coal Tipples 352 



Examples of Steel Coal Tipples 352 



W. P. Rend Steel Coal Tipple 352 



Spring Valley Shaft No. 5 Steel Coal 



Tipple 355 



Phillip's Mine Steel Coal Tipple 356 



Data on Steel Coal Tipples 360 



Specifications for Steel Head Frames and 



Coal Tipples, Washers and Breakers. 361 



References 363 



