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2. Swing yarder - Wikipedia

   en.wikipedia.org/wiki/Swing_yarder

   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 ...

3. Block and tackle - Wikipedia

   en.wikipedia.org/wiki/Block_and_tackle

   Examples of use (in an arboricultural setting) include: tail minding/tending, and for setting a rigging point in the tree above the cut to take place—a positive rigging situation. Snatch or impact blocks: used for heavier loads and more dynamic rigging, the cheeks of these blocks are fixed in place with a pin which locks into the opposite cheek.

4. Christmas tree (oil well) - Wikipedia

   en.wikipedia.org/wiki/Christmas_tree_(oil_well)

   Some trees have a second swab valve, the two arranged one on top of the other. The intention is to allow rigging down equipment from the top of the tree with the well flowing while preserving the two-barrier rule. With only a single swab valve, the upper master valve is usually closed to act as the second barrier, forcing the well to be shut in ...

5. Single-rope technique - Wikipedia

   en.wikipedia.org/wiki/Single-rope_technique

   For safe single-rope technique, especially on drops with complex rigging with intermediate belays, it is essential that the abseiling device can be removed from the rope without being unclipped from the harness. This is a problem with the simplest device, the single piece figure eight. These also twist the rope, which is a problem if there is a ...

6. Lumberjack - Wikipedia

   en.wikipedia.org/wiki/Lumberjack

   The high climber (also known as a tree topper) established a spar tree so logs could be skidded into the landing. Using tree climbing gaffs and rope to ascend a tall tree in the landing area of the logging site, he would chop off limbs as he climbed, chop off the top of the tree, then attach pulleys and rigging to the tree for the yarder.

7. Go-devil - Wikipedia

   en.wikipedia.org/wiki/Go-devil

   Since the go-devil has no tongue it can be turned around in a small space. The draft rigging consists of chains fastened to either side of the bunk or to the runners. The chains are brought forward and joined directly in front of the roller by a ring to which the hook on the double-tree is attached.