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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).
An ideal block and tackle with a moving block supported by n rope sections has the mechanical advantage (MA), = =, where F A is the hauling (or input) force and F B is the load. Consider the set of pulleys that form the moving block and the parts of the rope that support this block.
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 ...
Tandem-rotor helicopter lifting a log Helicopter pruning. Heli-logging, or helicopter logging, is a method of logging that uses helicopters to remove cut trees from forests by lifting them on cables attached to a helicopter. [1] Helicopter logging is often used in inaccessible areas of forests. Because the use of helicopters reduces the level ...
[12] [32] In 1915, George Hume purchased a third Shay engine and more log cars and yarding engines, expanding the company's logging equipment to include 70 railroad cars, three locomotives, 12 steam donkeys, one McGiffert loader, and one railroad crane. The company hired 1,500 men for the 1916 season, preparing for one of its heaviest cuts on ...
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Gel-Nimbus 25. With soft, cloud-like gel cushioning in the midsole, the Asics Gel-Nimbus 25 shoes have the stamp of approval from Anne Sharkey, D.P.M., a podiatrist at North Austin Foot & Ankle ...
Crosshole sonic logging (CSL) is a method to determine the structural integrity of drilled shafts and other concrete piles. The CSL method is considered to be more accurate than sonic echo testing in the determination of structural soundness of concrete within the drilled shaft inside of the rebar cage. This method provides little indication of ...