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  2. Trap bar - Wikipedia

    en.wikipedia.org/wiki/Trap_bar

    Trap bars often have two pairs of handles: one pair projects upwards in a squared D shape from the bar and one pair is level with the bar. The bar can be flipped over to make either pair more accessible. This gives a choice of two different grip heights with which to begin the lift. The trap bar (also referred to as the hex bar) is an implement ...

  3. Catch points - Wikipedia

    en.wikipedia.org/wiki/Catch_points

    A trap road with stops is a short dead-end siding leading to some method of stopping a vehicle, such as a sand drag or buffer stop. Wide to gauge trap points have switches that work in opposite directions and are therefore either both open or both closed. Vehicles derailed at these points will tend to continue in a forward direction rather than ...

  4. Trapdoor - Wikipedia

    en.wikipedia.org/wiki/Trapdoor

    It is traditionally small in size. [2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [ 3 ] The trapdoor has played a pivotal function in the operation of the gallows , cargo ships , trains , [ 4 ] booby traps , [ 5 ] and more recently theatre and films.

  5. Trapbar - Wikipedia

    en.wikipedia.org/?title=Trapbar&redirect=no

    Language links are at the top of the page across from the title.

  6. Parts of a theatre - Wikipedia

    en.wikipedia.org/wiki/Parts_of_a_theatre

    A trap room, orchestra pit, or even the front of house can be used as crossovers. Fly system : A fly system is a system of ropes, counterweights, pulleys, and other such tools designed to allow a technical crew to quickly move set pieces, lights, and microphones on and off stage quickly by "flying" them in from a large opening above the stage ...

  7. Railroad switch - Wikipedia

    en.wikipedia.org/wiki/Railroad_switch

    A right-hand railroad switch with point indicator pointing to right Animated diagram of a right-hand railroad switch. Rail track A divides into two: track B (the straight track) and track C (the diverging track); note that the green line represents direction of travel only, the black lines represent fixed portions of track, and the red lines depict the moving components.

  8. Open web steel joist - Wikipedia

    en.wikipedia.org/wiki/Open_web_steel_joist

    The first joist in 1923 was a Warren truss type, with top and bottom chords of round bars and a web formed from a single continuous bent bar. Various other types were developed, but problems also followed because each manufacturer had their own design and fabrication standards.

  9. Bullet trap - Wikipedia

    en.wikipedia.org/wiki/Bullet_trap

    A bullet trap (or pellet trap when used specifically for air guns) is a device to stop and collect projectiles fired at a shooting range to prevent overpenetrations and stray shots. Bullet traps typically use friction , impact or gradual deceleration to stop bullets.

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