xiv 



L7Sr OF ILLUSTRATIONS. 



PAGE 



. 116 



MOVABLE DAMS. 

 View of dam trestles caught by drift 



NEEDLB DAMS. 



General drawing of an early Poirve dam *i8 



Views of the needle dam at Louisa. Ky. (two 



general views) 219 



Views of the needle dam at Louisa. Ky. (raising 



the weir trestles and weir trestles lying down) 220 

 Views of the needle dam at Louisa. Ky. (placing 



the pass needles, and view of pass trestles and 



needles) o 



Section of needle dam. lower Seine 221 



View of needle dam at Klecan, Bohemia 224 



CHANOINB WICKET DAMS. 



Section of pass, Port-a-1'Anglais dam, river 



Seine 228 



General view of wickets and foot bridge of a 



Chanoine dam 229 



Sections of pass and weir, Dam No. 7, Kanawha 



River. W. Va 231 



General plan and sections, Davis Island dam, 



Ohio River 233 



General view of pass. Dam No. 6, Ohio River. . . 235 

 View of pass wickets, Dam No. 6. Ohio River. . . 237 

 General view of Dam No. n, Kanawha River, 



W. Va 239 



GATE, CURTAIN, AND BRIDGE DAMS. 



Perspective view of BouU- gates and trestles .... 241 

 Section of dam on the river Moskva, Russia .... 242 

 General view of the Libschitz dam. Bohemia .... 242 

 Elevation of a curtain dam with bridge support. 243 



PAGE 



Lowering the pass trestles, Libschitz dam 244 



Method of handling curtains on service truck .... 244 



View of trestles, Libschitz dam 346 



Early bridge dam on the Yonne 447 



General section of the Poses dam, river Seine . . 248 

 Section showing bridges and crane, Poses dam . . 24Q 

 Details of curtains and frames, Poses dam 250 



SHUTTER AND A-FRAME DAMS. 



Sections, etc., of Th^nard shutter dams 252 



Section of Girard shutter dam 253 



General design for an A-frame dam 255 



View of A-frame and bear-trap weirs, Dam No. 6, 

 Ohio River 257 



DRUM WICKETS AND BEAR-TRAPS. 



Section of drum wicket on the river Spree, Ger- 

 many a6o 



Section of drum wicket on the Osage River, 



Missouri 260 



Section of drum wicket on the river Marne, 



France 261 



Sections of bear-trap dams 262 



Details of bear-trap at Louisville, Ky 263 



Curves for proportioning "old" bear-traps 264 



Curves for proportioning "Parker" bear-traps.. 266 



GENERAL VIEWS. 



Raft chute at the Troja dam, Bohemia, during 



construction 269 



Raft chute at the Troja dam, completed 269 



View of trestles of pass. Libschitz dam, Bohemia. 270 

 Raft chute at the Libschitz dam 271 



LIST OF DETAIL DRAWINGS. 



1. Types of guide cribs. 



2. Examples of fixed dams in America, of masonry. 



3. Examples of fixed dams in America, of timber. 



4. Section of timber dam for rivers of small floods. 

 Trestle of the needle dam at Klecan, Bohemia. 



5. Pass trestle and needle dam at Louisa, Ky. 



6. Details of wickets, Chanoine dams. 



7. Details of horses, etc., Chanoine dams. 



8. Details of hurters. Chanoine dams. 



9. Details of trestles, Chanoine dams. 



10. Trestle of the Bould dam at Libschitz, Bohemia, 



it. Details of A-frames, Dam No. 6, Ohio River. 



12. Details of balanced valves for lock-gates. 



13. Details of balanced wickets for culverts. 



14. Details of drum valves. 



15. Fittings for lock-gates. 



1 6. Design for a wooden lock-gate. 



17. Design for a steel lock-gate, vertical framing. 



18. Design for a steel lock-gate, horizontal framing. 



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