Logging; the principles and general methods of operation in the United States . r machines can beoperated for 4500 feet (Fig. 58). Distances in excess of 3500feet usually are not regarded as desirable because breaks in thecable are more or less frequent and on very long hauls the lossof time in locating and repairing them is excessive. The canals are dug by large dredges at a cost of from $3000to $5000 per mile. They are from 40 to 50 feet wide, carryabout 6 feet of water and are often several miles in at first intended solely for logging purposes, canals inrecent years have be
Logging; the principles and general methods of operation in the United States . r machines can beoperated for 4500 feet (Fig. 58). Distances in excess of 3500feet usually are not regarded as desirable because breaks in thecable are more or less frequent and on very long hauls the lossof time in locating and repairing them is excessive. The canals are dug by large dredges at a cost of from $3000to $5000 per mile. They are from 40 to 50 feet wide, carryabout 6 feet of water and are often several miles in at first intended solely for logging purposes, canals inrecent years have been built with the idea of ultimately using POWER SKIDDING 209 them for drainage purposes. The early operators had difficultybecause they started to use the canals from the mill end, and somuch debris and mud were drawn into the water, that frequentdredging was necessary to keep the channel open. The practicenow is to dig the canal and begin logging at the far end, workingtoward the mill. Log barriers are now used, which preventmost of the refuse from falling into the -3,9800 Fig. 58. — The Arrangement of the Roads down which Logs are pulled to thePullboat. This system is known as fantailing. The figure is adapted from anactual operation in a Louisiana cypress swamp. Pullboats operated from the shores of lakes or from widebayous are moored to nests of piling driven off-shore, and thetimber usually is pulled in straight lines. In laying out a pullboat job it is necessary to locate and cutout main and secondary roads down which the logs are draggedto the canal or bayou. The foreman may locate the main andsecondary roads on a map in the office before going to the field,and determine at just what points on the boundary roads willterminate, and the angle at which they should run toward thepullboat. The far end of the cable passes through a sheaveblock fastened to a tail tree. These should not be more than 150feet apart; for logs cannot readily be side-lined for more than 7
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcet, bookyear1913
