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Towing with a drawbar is a good, practical system for many purposes, and it has continued to be used even up to today, but the three-point hitch outperforms it in several ways (described below). Harry Ferguson patented the three-point linkage for agricultural tractors in Britain in 1926. He had long been a champion of the importance of rigid ...
The butterfly loop, also known as lineman's loop, butterfly knot, alpine butterfly knot and lineman's rider, is a knot used to form a fixed loop in the middle of a rope. Tied in the bight , it can be made in a rope without access to either of the ends; this is a distinct advantage when working with long climbing ropes.
A Petzl Croll is an ascending device [1] used in caving and industrial rope access made by the French company Petzl. Its name comes from the town Crolles where Petzl's company headquarters are located but might also be a reference to the nearby cave system of the Dent de Crolles , the exploration of which triggered a lot of technical effort ...
Lineman's pliers sometimes include an integrated crimping device in the craw of the handle side of the pliers' joint. Lineman's pliers have a tapered nose suitable for reaming the rough edge of a 1 ⁄ 2 -inch (13 mm) or larger conduit , or cleaning sharp metal from the inside of a standard metal knockout in an electrical enclosure such as a ...
An ascender is a device (usually mechanical) used for directly ascending, or for facilitating protection, with a fixed rope when climbing on steep mountain terrain. A form introduced in the 1950s became so popular it began the term "Jumar" for the device, and the verb "to jumar" to describe its use in ascending.
The rope to be pulled is passed through a pulley, and a Prusik is tied on the loaded side. When the rope is pulled, the Prusik rides against the pulley, and the rope slides through it; but when the rope is relaxed, the Prusik slides away from the pulley and grabs the rope. Thus, the combination acts as a ratchet (or Progress Capture Device (PCD)).
[1] [2] Fixed ropes also help to identify the line of the climbing route in periods of low visibility (e.g. a storm or white-out). [1] [2] The act of ascending a fixed rope is also called jumaring, which is the name of a type of ascender device, [3] or also called jugging in the US. [4]
The MDK-2M was a Soviet Cold War era artillery tractor. It was based on the chassis of the AT-T, [1] which itself is based on the chassis and drive system from the T-54 tank.. The MDK-2M was used for rapid digging of large coverages and for drawing tank trenches, with a digging depth up to 4.7 m width, and width 3.5 - 4m.
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