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  2. Chinese siege weapons - Wikipedia

    en.wikipedia.org/wiki/Chinese_siege_weapons

    The hook carts join the fray and the nine oxen turn and heave, bellowing like thunder, and furiously smash the towers and overturn the parapets... Then the flying ladders, movable overlooks, cloud pavilions and the buildings in the void are rolled forward into the breaches so that the attackers can swarm into the city. [2] —

  3. Protective equipment in gridiron football - Wikipedia

    en.wikipedia.org/wiki/Protective_equipment_in...

    Quilted hip pads date to the 1890s and are one of the earliest pieces of protective football gear known. Today, hip and tailbone pads are made of plastic and protect the hips, pelvis, and coccyx or tailbone. The pads are inserted into the pockets of a girdle worn under the football pants.

  4. Safety (gridiron football position) - Wikipedia

    en.wikipedia.org/wiki/Safety_(gridiron_football...

    The defensive responsibilities of the safety and cornerback usually involve pass coverage towards the middle and sidelines of the field. While American (11-player) formations generally use two safeties, Canadian (12-player) formations generally have one safety and two defensive halfbacks, a position not used in the American game.

  5. Nickel defense - Wikipedia

    en.wikipedia.org/wiki/Nickel_defense

    The Texas A&M–Commerce Lions in a nickel defense against the Adams State Grizzlies in 2015. In American football, a nickel defense (also known as a 4–2–5 or 3–3–5) is any defensive alignment that uses five defensive backs, of whom the fifth is known as a nickelback.

  6. Silicone rubber keypad - Wikipedia

    en.wikipedia.org/wiki/Silicone_rubber_keypad

    On depression of the switch, the webbing uniformly deforms to produce a tactile response. When pressure is removed from the switch, the webbing returns to its neutral position with positive feedback. To make an electronic switch, a carbon or gold pill is placed on the base of the switch center which contacts onto a printed circuit board when ...

  7. Close-in weapon system - Wikipedia

    en.wikipedia.org/wiki/Close-in_weapon_system

    Kashtan CIWS. A close-in weapon system (CIWS / ˈ s iː w ɪ z / SEE-wiz) [1] is a point-defense weapon system for detecting and destroying short-range incoming missiles and enemy aircraft which have penetrated the outer defenses, typically mounted on a naval ship.

  8. Portal:Aviation/Anniversaries/July - Wikipedia

    en.wikipedia.org/wiki/Portal:Aviation/...

    Pilot Maj. Raleigh Myers experiences an oxygen fire in the cockpit after a pressure-reducing switch fails, ignited by the 24-volt power supply line to the switch. He bails out at 24,000 feet (7,300 m), escaping safely. The oxygen supply system is subsequently redesigned.

  9. Phalanx CIWS - Wikipedia

    en.wikipedia.org/wiki/Phalanx_CIWS

    The Phalanx Close-In Weapon System (CIWS) was developed as the last line of automated weapons defense (terminal defense or point defense) against all incoming threats, including antiship missiles (AShMs or ASMs), aircraft including high-g and maneuvering sea-skimmers, and small boats.