File:Logging; the principles and general methods of operation in the United States (1913) (14596320930).jpg

Identifier: loggingprincip00brya (find matches)
Title: Logging; the principles and general methods of operation in the United States
Year: 1913 (1910s)
Authors: Bryant, Ralph Clement, b. 1877
Subjects: Lumbering
Publisher: New York : J. Wiley & Sons (etc., etc.)
Contributing Library: University of British Columbia Library
Digitizing Sponsor: University of British Columbia Library

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Text Appearing Before Image:
By permission of the Lidgerwood Mfg. Co.Fig. 54. — A Cableway Skidder showing the Arrangement of the Linesfor Skidding and Loading. to draw the trolley out along the main cable. The f- or;-inch skidding line passes from a drum on the engine, througha block on the head spar tree, then through a block on thetrolley. It serves as a point of attachment for tongs or other POWER SKIDDING 199 skidding devices. The logs are dragged up to the main cableby this line, which also suspends them and serves to return thetrolley to the head spar tree. When the trolley is run out from the head spar tr^e, theskidding line sags between the two points of support and itsweight pulls the tongs against the trolley. The line is either
Text Appearing After Image:
Fig. 55. — Cutting the Top from a Head Spar on which is placed the Main CableRigging for a Cableway Skidder. Cypress Forest, Louisiana. pulled down and dragged by hand to the logs to be skidded, anoperation requiring the services of 5 or 6 men and involving aloss of time for the entire crew, or a patent slack puller is usedwhich draws the slack out of the skidding line. A third f-inchcable is requiredfor operating the slack pulling device. Power for operating the cableway system is provided by anupright boiler and a pair of engines mounted on a steel frame, 200 LOGGING which is supported on two sets of trucks, each of which is pivoted.The machine is moved from one set-up to another by means ofa locomotive. On arrival at the location where it is to be used,the frame is elevated above the rails by hydraulic jacks, thetrucks turned in a quarter circle, and a short span of track placedimder each truck. The machine is then lowered and shuntedoff to one side of the railroad by the side of

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