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A swing yarder is a mobile piece of heavy duty forestry equipment used for pulling logs from the woods to a logging road with cables. The swing yarder is also known as a grapple yarder. In any logging operation, it is necessary to transport the harvested tree from the stump to a landing for transport to market (usually on a truck). If the ...
Excelsior log rotator Thomas Walker & Son insignia. Thomas Walker & Son were inventors and makers of nautical instruments in the 19th and 20th centuries. The firm made one of the most commonly used navigation instruments, the 'log' which allowed sailors to measure distance at sea, [1] [2] one of the main measurements used in nautical navigation.
A yarder is piece of logging equipment that uses a system of cables to pull or fly logs from the stump to a collection point. [1] It generally consists of an engine, drums, and spar, but has a range of configurations and variations, such as the swing yarder. Clyde Skidder at Marathon Logging Camp near Newton, MS ~1921 Madill 124 Yarder. An ...
High Lead logging in Western Oregon Cable grue Larix 3T, installed on agricultural tractor. Cable logging, also referred to as skyline logging, is a logging method primarily used on the West Coast of North America with yarder, loaders, and grapple yarders, but also in Europe (Austria, Switzerland, Czech Republic, France, Italy).
High lead logging is a method of cable logging using a spar, yarder and loader. It was developed by Oscar Wirkkala. It is accomplished with two lines (cables) and two winches (or cable drums). The mainline or yarding line extends out from one winch, while a second usually lighter line called the haulback line extends out from the other winch to ...
In logging and other engineering vehicles, a grapple is a hydraulically powered claw with two or more opposing levers that pinch a log or other materials, usually to lift or drag them. The logging grapple used in swing yarding is not moved by hydraulics but by cables. To open and close the tongs of the grapple, two cables are used.
A slip tongue log skidder used in the 19th and early 20th centuries Elements of a skidding harness. A skidder is any type of heavy vehicle used in a logging operation for pulling cut trees out of a forest in a process called "skidding", in which the logs are transported from the cutting site to a landing.
Shovel logging, sometimes called Hoe Chucking, uses a log loader to swing logs to the forest road. Shovel logging is one of a number of methods that may be used to move logs from forest to road. Rather than driving out to the log and dragging it back to the landing, the loader moves slowly across the harvest area, grabbing logs/trees within ...
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