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As defensive weapons, traction trebuchets were positioned behind city walls and guided by an "artillery observer" on the walls. Range was determined by the strength and number of men pulling. Increasing and decreasing range meant adding and removing men from the pulling ropes.
Craigslist headquarters in the Inner Sunset District of San Francisco prior to 2010. The site serves more than 20 billion [17] page views per month, putting it in 72nd place overall among websites worldwide and 11th place overall among websites in the United States (per Alexa.com on June 28, 2016), with more than 49.4 million unique monthly visitors in the United States alone (per Compete.com ...
The New York roof hook (or halligan hook) is a firefighting tool used mostly for rooftop operations including vertical and horizontal ventilation, [1] pulling and prying. Developed in the 1940s by FDNY Deputy Chief Hugh Halligan, a prolific firefighting inventor who also designed the Halligan bar , the tool is composed of a 6-foot (1.8 m) long ...
This proven system was combined with a purpose-made mounting, capable of fast elevation and traverse speeds, to track incoming targets. An entirely self-contained unit, the mounting houses the gun, an automated fire-control system and all other major components, enabling it to automatically search for, detect, track, engage, and confirm kills ...
A rail system mounted on top of a SIG SG 550 A dovetail rail on a rifle receiver for mounting a sight. A rail integration system (RIS; also called a rail accessory system (RAS), rail interface system, rail system, mount, base, gun rail, or simply a rail [1]) is a generic term for any standardized attachment system for mounting firearm accessories via bar-like straight brackets (i.e. "rails ...
Lead rein A third rein used on bridles, not to be confused with the single lead rope of a halter nor the direct rein aid also known as the "leading rein". In North America a third rein is most commonly seen as part of the mecate of a hackamore. In Mongolia it is integral to the bridle, and tied to either a bit ring or a chin strap. Long reins ...
Reconstruction of a palisade in a Celtic village at St Fagans National History Museum, Wales Reconstruction of a medieval palisade in Germany. A palisade, sometimes called a stakewall or a paling, is typically a row of closely placed, high vertical standing tree trunks or wooden or iron stakes used as a fence for enclosure or as a defensive wall.
Observatory car drawing from a December 1916 Scientific American cover Juray fish-shaped spy gondola while crewed. The spy gondola, spy basket, observation car or sub-cloud car (German: Spähgondel or Spähkorb) is a crewed vessel that an airship hiding in cloud cover could lower several hundred metres [1] to a point below the clouds in order to inconspicuously observe the ground and help ...