TABLE OF CONTENTS. XXIX 



CHAPTER XV. 

 THE STONE ARCH. 



AM. PAOH 



167. Definitions, etc 315 



168. Pressure line 315 



169. Sliding of the joints 315 



170. Forces acting upon a cross-section Neutral axis 316 



171. Kernd of a cross-section 317 



172. Position of kernel for different cross-sections 318 



173. Proper position of resultant pressure 320 



174. Pressure line True pressure line 321 



175. Support line 322 



176. Deviation of support from pressure line 323 



177. Dimensions of the arch 324 



178. Construction of the pressure line 326 



179. Practical example '328 



180. Proper depth of arch at crown 329 



181. Increase of depth due to change of form 330 



182. Example. 330 



CHAPTER XYI. 



THE INVERTED ARCH SUSPENSION SYSTEM. 



183. Methods of construction 331 



184. Rear chains, and anchorages 331 



185. Cable with auxiliary stiffening truss. 333 



186. Method of loading causing maximum strains 334 



187. Example 336 



188. Analytical investigation of the forces acting upon the stiffening 



truss 337 



189. Concluding remarks 839 



APPENDIX. 



NOTE TO CHAP. VHI. OF THE INTRODUCTION UPON THE MODERN 



GEOMETRY. 

 NOTE TO CHAPTER 1 350 



2. Bent crane 350 



3. Character of strains in the pieces as indicated by the strain diagram, 351 

 4. Pieces in equilibrium Points to be avoided in constructing the 



strain diagram 351 



5. Roof truss Method of checking the accuracy of the diagram 352 



6. The French roof truss Solution apparently indeterminate Method 



of solution Method of calculation by moments 853 



7. Application to bridges Bowstring girder Method of tabulation 



illustrated 854 



8. Strains in the flanges Table 857 



9. Method of calculation by moments 858 



10. Girder with straight flanges Howe or Murphy Wbjpple system of 



bracing 859 



