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  2. Pons asinorum - Wikipedia

    en.wikipedia.org/wiki/Pons_asinorum

    The pons asinorum in Oliver Byrne's edition of the Elements [1]. In geometry, the theorem that the angles opposite the equal sides of an isosceles triangle are themselves equal is known as the pons asinorum (/ ˈ p ɒ n z ˌ æ s ɪ ˈ n ɔːr ə m / PONZ ass-ih-NOR-əm), Latin for "bridge of asses", or more descriptively as the isosceles triangle theorem.

  3. Drawbridge - Wikipedia

    en.wikipedia.org/wiki/Drawbridge

    Animation showing the operation of a drawbridge. A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat.In some forms of English, including American English, the word drawbridge commonly refers to all types of moveable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the ...

  4. Outline of bridges - Wikipedia

    en.wikipedia.org/wiki/Outline_of_bridges

    Submersible bridge – also called a ducking bridge, the bridge deck is lowered into the water; Tilt bridge – the bridge deck, which is curved and pivoted at each end, is lifted at an angle; Swing bridge – the bridge deck rotates around a fixed point, usually at the centre, but may resemble a gate in its operation ; road or rail

  5. Skew arch - Wikipedia

    en.wikipedia.org/wiki/Skew_arch

    Colorado Street Bridge, an example of a false skew arch. The strength of a regular arch (also known as a "square" or "right" arch) comes from the fact that the mass of the structure and its superincumbent load cause lines of force that are carried by the stones into the ground and the abutments without producing any tendency for the stones to slide with respect to one another.

  6. Four-centred arch - Wikipedia

    en.wikipedia.org/wiki/Four-centred_arch

    Construction of a four-centred arch. A four-centred arch (Commonwealth spelling) or four-centered arch (American spelling) is a low, wide type of arch with a pointed apex.Its structure is achieved by drafting two arcs which rise steeply from each springing point on a small radius, and then turning into two arches with a wide radius and much lower springing point.

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  8. Howe truss - Wikipedia

    en.wikipedia.org/wiki/Howe_truss

    A diagonal brace in each panel strengthens the bridge, and a diagonal counter-brace in each panel enhances this strength. [10] Howe truss bridges may be all wood, a combination of wood and iron, or all iron. [11] Whichever design is used, wooden timbers should have square ends without mortise and tenons. [12]

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