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An extension ladder. A ladder is a vertical or inclined set of rungs or steps commonly used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface such as a wall, and rollable ladders, such as those made of rope or aluminium, that may be hung from the top.
The whirlwind trebuchet used a single vertical pole which could be rotated 360 degrees for increased versatility at the cost of projectile strength. The four footed trebuchets were essentially the same as the previous Warring States weapons, differentiated from the whirlwinds by specifying its stability and larger size.
SPST-NC (Single-Pole Single-Throw, Normally-Closed) relays have a single Form B or break contact. As with an SPST-NO relay, such a relay has four terminals in total. SPDT (Single-Pole Double-Throw) relays have a single set of Form C, break before make or transfer contacts. That is, a common terminal connects to either of two others, never ...
Escalade consists of attacking soldiers advancing to the base of a wall, setting ladders, and climbing to engage the defending forces. Though very simple and direct, it was also one of the most dangerous options available; escalade would generally be conducted in the face of arrow fire from the battlements, and the defenders would naturally attempt to push ladders away from the wall.
A A-grade Also aid climbing grade. The technical difficulty grading system for aid climbing (both for "original" and an adapted version for "new wave"), which goes: A0, A1, A2, A3, A4, A5 and up to A6 (for "new wave"). See C-grade. Abalakov thread Abalakov thread Also V-thread. A type of anchor used in abseiling especially in winter and in ice climbing. ABD Also assisted braking device. A term ...
How a single mother in Raleigh skipped traditional mortgage to step on property ladder. Chantal Allam. January 30, 2024 at 5:30 AM ...
In its most basic form, a Jacob's staff is a stick or pole with length markings; most staffs are much more complicated than that, and usually contain a number of measurement and stabilization features. The two most frequent uses are: in astronomy and navigation for a simple device to measure angles, later replaced by the more precise sextants;
The term "gallows" was derived from a Proto-Germanic word galgô that refers to a "pole", "rod" or "tree branch". [1]With the beginning of Christianization, Ulfilas used the term galga in his Gothic Testament to refer to the cross of Christ, until the use of the Latin term (crux = cross) prevailed.
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