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  2. Oscillating turret - Wikipedia

    en.wikipedia.org/wiki/Oscillating_turret

    Additionally, in a conventional design elevating the barrel of the gun pivots the breech into the tank hull, which requires the turret ring to be large enough to allow this. In an oscillating design, the breech may remain above the turret ring, in which case the ring can be smaller, potentially allowing the hull to be smaller as well.

  3. Rain gutter - Wikipedia

    en.wikipedia.org/wiki/Rain_gutter

    Water falls towards a parapet gutter, a valley gutter or an eaves gutter. [12] When two pitched roofs meet at an angle, they also form a pitched valley gutter: the join is sealed with valley flashing. Parapet gutters and valley gutters discharge into internal rainwater pipes or directly into external down pipes at the end of the run. [12]

  4. Face seal - Wikipedia

    en.wikipedia.org/wiki/Face_seal

    A gasket (orange) used as a face seal to prevent flow from escaping from a pipe flange joint. In mechanical engineering, a face seal is a seal in which the sealing surfaces are normal to the axis of the seal.

  5. Quad chart - Wikipedia

    en.wikipedia.org/wiki/Quad_chart

    A quad chart is a form of technical documentation used to briefly describe an invention or other innovation through writing, illustration and/or photographs. [1] Such documents are described as "quad" charts because they are divided into four quadrants laid out on a landscape perspective.

  6. Yagi–Uda antenna - Wikipedia

    en.wikipedia.org/wiki/Yagi–Uda_antenna

    Quartet of two-dipole Yagi arrays (Hirschgeweih) of the German FuG 220 VHF-band radar on the nose of a late-World War II Bf 110 night fighter aircraftThe antenna was invented by Shintaro Uda of Tohoku Imperial University, Japan, [5] in 1926, with a lesser role played by Hidetsugu Yagi.

  7. Quadrant roadway intersection - Wikipedia

    en.wikipedia.org/wiki/Quadrant_roadway_intersection

    The design is intended for intersections where large artery routes meet in an area of dense development and high pedestrian volume. [ 1 ] [ 2 ] Proponents also point to a reduction in places where accidents could occur from vehicles potentially crossing paths, as well as a low development cost compared to roundabouts or the more complex single ...

  8. Flat no-leads package - Wikipedia

    en.wikipedia.org/wiki/Flat_no-leads_package

    Flat no-leads packages such as quad-flat no-leads (QFN) and dual-flat no-leads (DFN) physically and electrically connect integrated circuits to printed circuit boards. Flat no-leads, also known as micro leadframe (MLF) and SON (small-outline no leads), is a surface-mount technology , one of several package technologies that connect ICs to the ...

  9. Quad antenna - Wikipedia

    en.wikipedia.org/wiki/Quad_antenna

    A quad antenna is a type of directional wire radio antenna used on the HF and VHF bands. A quad is a Yagi–Uda antenna ("Yagi") made from loop elements instead of dipoles: It consists of a driven element and one or more parasitic elements; however in a quad, each of the loop elements may be square, round

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