Logging; the principles and general methods of operation in the United States . urer states that the cost of logs on the car isabout one-third less than for similar timber logged with yardingengines. This is due to a reduction in the mileage of railroadspurs required and to the elimination of sniping, barking androad swamping. THE SXAKIKG SYSTEM This is a ground system in which the cables are taken to thelogs by animals. The essential features are an upright boiler with two, three^ The Timberman, Portland, Oregon, .\ugust, 191c, p. 36. POWER SKIDDING 205 or four independent skidding drums moun
Logging; the principles and general methods of operation in the United States . urer states that the cost of logs on the car isabout one-third less than for similar timber logged with yardingengines. This is due to a reduction in the mileage of railroadspurs required and to the elimination of sniping, barking androad swamping. THE SXAKIKG SYSTEM This is a ground system in which the cables are taken to thelogs by animals. The essential features are an upright boiler with two, three^ The Timberman, Portland, Oregon, .\ugust, 191c, p. 36. POWER SKIDDING 205 or four independent skidding drums mounted either on a heavyframe and trucks or on a frame which is supported at the cornerson legs or spuds. The first type is transported under its ownpower by a chain drive, and the latter type during transit restson a fiat car which is drawn by a locomotive.• The machine has a heavy pulling boom at one or both ends ofthe frame, from the peak of which blocks are suspended throughwhich the skidding lines pass out. The pulling booms are guyedon either side to give them Fig. 57. A Portable Snaking Machine operating in a Longleaf PineForest. Portable snaking machines are not equipped with a loadingdevice but are supplied with a cable by means of which logsmay be piled up along the track ready for a special loadingcrew. When the snaking machine is not transported on its owntrucks, it is equipped with a loading boom and the logs areloaded on cars as they are skidded. The machine is raised offthe flat car by means of hydraulic jacks and then the corners areblocked up. The log cars are run under the skidder when theyare brought to the woods and are pulled forward under theloading boom by means of a spotting cable as required forloading. The skidding cables are single lines which are carriedby a mule or horse to the log to which they are attached by a 2o6 LOGGING pair of tongs or a choker and then drawTi in. The animal isridden back to the machine and after the cable is
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcet, bookyear1913
