XVI LIST OF ILLUSTRATIONS 



FIG. PAGE 



37. Yarding sled trails leading down to a skidway on a two-sled road. Maine 162 



38. A yarding sled road built up on a curve to prevent the sleds from leaving 



the road. Maine 163 



39. A two-sled road, showing the method of building up the grade on side 



slopes 165 



40. A snow shed on a two-sled road. Maine 167 



41. A sprinkler being filled with water from a brook. Maine 169 



42. A Lombard steam log hauler 173 



43. Tj^pe of sled used with a steam log hauler 175 



44. The method of loading logs on a bummer 178 



45. The Perry log cart in position to load 180 



46. The Perry log cart loaded 181 



47. A slip tongue cart in a southern yellow pine forest 183 



48. A four-wheeled log wagon at the skidway. Missouri 186 



49. An eight-wheeled log wagon with a load of yellow pine logs. Louisiana. 189 



50. Loading a log wagon by means of the cross-haul. Missouri 191 



51. A Holt three-wheeled traction engine hauHng sugar pine logs. Cali- 



fornia 194 



52. A steel spar cableway skidder, showing loading boom in front 197 



53. A tail tree, showing the method of attaching the blocks to the tree; also 



the arrangement of the guys 198 



54. A cableway skidder, showing the arrangement of the lines for skidding 



and loading 198 



55. Cutting the top from a head spar tree on which is placed the main cable 



rigging for a cableway skidder 199 



56. Method of shifting the main cable from one run to another 201 



57. A portable snaking machine operating in a Texas longleaf pine forest. . . 205 



58. The arrangement of the roads down which logs are pulled to the puUboat 209 



59. The sheave block attached to the tail tree 210 



60. A single-wire tramway used in the Pacific Coast forests 224 



61. A single-cable aerial tramway in use in the Pacific Coast forests 225 



62. A single-cable tramway 227 



63. View down a timber slide. Idaho 231 



64. The terminus of a log slide. Idaho 232 



65. A whippoorwill switch for throwing logs from a slide 2^s 



66. A sawed timber slide, sometimes used where the wear is e.xcessive 2^^ 



67. A fore-and-aft or pole road used with a road engine. Pacific Coast. . . . 234 



68. A timber chute. New Hampshire 235 



69. A turn of logs ready to move along a trailing slide 238 



70. An "L" hook used for attaching the tow line to the turn of logs 239 



71. Goose-necks used for checking the speed of logs on heavy grades 240 



72. View down a pole tram-road in Idaho 243 



73. The type of car used on a pole tram-road in Idaho 244 



74. A stringer road in the Appalachian mountains 246 



75. Two methods of constructing a grade for a logging railroad 260 



76. Method of placing caps in the primer 274 



77. Forms of trestles and culverts commonly used on logging railroads 279 



78. A round timber framed trestle on a logging railroad 282 



